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How to reduce server power supply fan noise?
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John Doe
Feb 7, 2016, 10:58:59 AM2/7/16
to
See the bottom of this post for pictures. If you look closely, you can
see the power supply fan wires in one of those pictures.
I bought a legacy server with a 560 W power supply. It's dual fans are
too loud, apparently running 100% speed all the time. Might be okay for
flight simulation immersion, but No.
I suppose the easiest solution would be to put a resistor in series with
the power leads.
Another possibility would be to sever all but the sensor leads. And
connect the two power supply leads to the motherboard fan controllers.
Apparently the motherboard has settings for different fan voltages at
the fan outputs, and doesn't care about system temperature.
But the power supply needs to know that the fans are running, or it
shuts down the system. I suspect that slowing the fans would produce a
fault, just like removing the fans does. Do the sensors look for a fan
speed of at least a certain RPM? I guess so, just double checking.
How difficult might it be to determine and satisfy what signals the
power supply controller is looking for from the three wire fans?
Ideally, I would like to replace the power supply fan with a system
board fan. But those power supply fan connectors need satisfying.
Thanks.
--
https://www.flickr.com/photos/27532210@N04/24781725611/in/dateposted/
That's the power supply, plus two other pictures. It's supposed to be
used but I see zero signs of use.
http://www.ebay.com/itm/371543511693?
That's where I bought it. If you need something like that, don't
hesitate. But be advised that I don't sell anything.
see the power supply fan wires in one of those pictures.
I bought a legacy server with a 560 W power supply. It's dual fans are
too loud, apparently running 100% speed all the time. Might be okay for
flight simulation immersion, but No.
I suppose the easiest solution would be to put a resistor in series with
the power leads.
Another possibility would be to sever all but the sensor leads. And
connect the two power supply leads to the motherboard fan controllers.
Apparently the motherboard has settings for different fan voltages at
the fan outputs, and doesn't care about system temperature.
But the power supply needs to know that the fans are running, or it
shuts down the system. I suspect that slowing the fans would produce a
fault, just like removing the fans does. Do the sensors look for a fan
speed of at least a certain RPM? I guess so, just double checking.
How difficult might it be to determine and satisfy what signals the
power supply controller is looking for from the three wire fans?
Ideally, I would like to replace the power supply fan with a system
board fan. But those power supply fan connectors need satisfying.
Thanks.
--
https://www.flickr.com/photos/27532210@N04/24781725611/in/dateposted/
That's the power supply, plus two other pictures. It's supposed to be
used but I see zero signs of use.
http://www.ebay.com/itm/371543511693?
That's where I bought it. If you need something like that, don't
hesitate. But be advised that I don't sell anything.
bitrex
Feb 7, 2016, 11:06:39 AM2/7/16
to
On 02/07/2016 10:55 AM, John Doe wrote:
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
>
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
>
> Another possibility would be to sever all but the sensor leads. And
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does. Do the sensors look for a fan
> speed of at least a certain RPM? I guess so, just double checking.
>
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
>
> Ideally, I would like to replace the power supply fan with a system
> board fan. But those power supply fan connectors need satisfying.
>
> Thanks.
The lowest stress solution is probably just to get a whole new power
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
>
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
>
> Another possibility would be to sever all but the sensor leads. And
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does. Do the sensors look for a fan
> speed of at least a certain RPM? I guess so, just double checking.
>
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
>
> Ideally, I would like to replace the power supply fan with a system
> board fan. But those power supply fan connectors need satisfying.
>
> Thanks.
supply that's quieter and drop it in, unless you're pathologically
averse to spending money. ~500 watt server power supplies aren't
particularly expensive.
edward....@gmail.com
Feb 7, 2016, 11:19:02 AM2/7/16
to
On Sunday, February 7, 2016 at 7:58:59 AM UTC-8, John Doe wrote:
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
>
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
>
> Another possibility would be to sever all but the sensor leads. And
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does. Do the sensors look for a fan
> speed of at least a certain RPM? I guess so, just double checking.
>
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
>
> Ideally, I would like to replace the power supply fan with a system
> board fan. But those power supply fan connectors need satisfying.
>
> Thanks.
For a Dell poweredge 2950, I added three parallel 100 ohms 1/4W resistors to the PS fan and two of the four box fans, while removing the other two fans and one CPU. The noise level is substantially lower, as well as the power bill. That was six months ago and the server is still up since then.
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
>
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
>
> Another possibility would be to sever all but the sensor leads. And
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does. Do the sensors look for a fan
> speed of at least a certain RPM? I guess so, just double checking.
>
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
>
> Ideally, I would like to replace the power supply fan with a system
> board fan. But those power supply fan connectors need satisfying.
>
> Thanks.
Neon John
Feb 7, 2016, 11:31:31 AM2/7/16
to
On Sun, 7 Feb 2016 11:06:32 -0500, bitrex
<bit...@de.lete.earthlink.net> wrote:
>On 02/07/2016 10:55 AM, John Doe wrote:
>> See the bottom of this post for pictures. If you look closely, you can
>> see the power supply fan wires in one of those pictures.
Are the fans DC and 48 volts or less? IF so you're in luck. I'm just
<bit...@de.lete.earthlink.net> wrote:
>On 02/07/2016 10:55 AM, John Doe wrote:
>> See the bottom of this post for pictures. If you look closely, you can
>> see the power supply fan wires in one of those pictures.
about to release as Open Source the variable speed fan controller that
we use in our induction heaters.
It uses an LM35 that is mounted either in contact with the heat sink
or in the outlet air stream. This feeds an Atmel ATtiny processor
that PWMs the fan. It's rated at 2 amps.
I don't have any in stock right now but if you want to make your own I
can send you the CAD files and BOM.
Out of the box, upon power-up it POSTs the fans at 80% and then sets a
minimum speed of 20%. The setpoint is 40 deg C. If the temperature
deviates more than a degree the output is stepped 1% per second in
either direction. Since the source is included and it builds with the
GNU Atmel compiler, all those constants can be changed.
Contact me if you're interested.
John
John DeArmond
http://www.neon-john.com
http://www.tnduction.com
Tellico Plains, Occupied TN
See website for email address
John Doe
Feb 7, 2016, 11:34:04 AM2/7/16
to
bitrex <bit...@de.lete.earthlink.net> wrote:
> John Doe wrote:
>> See the bottom of this post for pictures. If you look closely, you
>> can see the power supply fan wires in one of those pictures.
>>
>> I bought a legacy server with a 560 W power supply. It's dual fans
>> are too loud, apparently running 100% speed all the time. Might be
>> okay for flight simulation immersion, but No.
>>
>> I suppose the easiest solution would be to put a resistor in series
>> with the power leads.
>>
>> Another possibility would be to sever all but the sensor leads. And
>> connect the two power supply leads to the motherboard fan
>> controllers. Apparently the motherboard has settings for different
>> fan voltages at the fan outputs, and doesn't care about system
>> temperature.
>>
>> But the power supply needs to know that the fans are running, or it
>> shuts down the system. I suspect that slowing the fans would produce
>> a fault, just like removing the fans does. Do the sensors look for a
>> fan speed of at least a certain RPM? I guess so, just double
>> checking.
>>
>> How difficult might it be to determine and satisfy what signals the
>> power supply controller is looking for from the three wire fans?
>>
>> Ideally, I would like to replace the power supply fan with a system
>> board fan. But those power supply fan connectors need satisfying.
> John Doe wrote:
>> See the bottom of this post for pictures. If you look closely, you
>> can see the power supply fan wires in one of those pictures.
>>
>> I bought a legacy server with a 560 W power supply. It's dual fans
>> are too loud, apparently running 100% speed all the time. Might be
>> okay for flight simulation immersion, but No.
>>
>> I suppose the easiest solution would be to put a resistor in series
>> with the power leads.
>>
>> Another possibility would be to sever all but the sensor leads. And
>> connect the two power supply leads to the motherboard fan
>> controllers. Apparently the motherboard has settings for different
>> fan voltages at the fan outputs, and doesn't care about system
>> temperature.
>>
>> But the power supply needs to know that the fans are running, or it
>> shuts down the system. I suspect that slowing the fans would produce
>> a fault, just like removing the fans does. Do the sensors look for a
>> fan speed of at least a certain RPM? I guess so, just double
>> checking.
>>
>> How difficult might it be to determine and satisfy what signals the
>> power supply controller is looking for from the three wire fans?
>>
>> Ideally, I would like to replace the power supply fan with a system
>> board fan. But those power supply fan connectors need satisfying.
> The lowest stress solution is probably just to get a whole new power
> supply that's quieter and drop it in, unless you're pathologically
> averse to spending money. ~500 watt server power supplies aren't
> particularly expensive.
Suggestions?
> supply that's quieter and drop it in, unless you're pathologically
> averse to spending money. ~500 watt server power supplies aren't
> particularly expensive.
John Doe
Feb 7, 2016, 11:41:46 AM2/7/16
to
edward....@gmail.com wrote:
> John Doe wrote:
>> See the bottom of this post for pictures. If you look closely, you
>> can see the power supply fan wires in one of those pictures.
>>
>> I bought a legacy server with a 560 W power supply. It's dual fans
>> are too loud, apparently running 100% speed all the time. Might be
>> okay for flight simulation immersion, but No.
>>
>> I suppose the easiest solution would be to put a resistor in series
>> with the power leads.
>>
>> Another possibility would be to sever all but the sensor leads. And
>> connect the two power supply leads to the motherboard fan
>> controllers. Apparently the motherboard has settings for different
>> fan voltages at the fan outputs, and doesn't care about system
>> temperature.
>>
>> But the power supply needs to know that the fans are running, or it
>> shuts down the system. I suspect that slowing the fans would produce
>> a fault, just like removing the fans does. Do the sensors look for a
>> fan speed of at least a certain RPM? I guess so, just double
>> checking.
>>
>> How difficult might it be to determine and satisfy what signals the
>> power supply controller is looking for from the three wire fans?
>>
>> Ideally, I would like to replace the power supply fan with a system
>> board fan. But those power supply fan connectors need satisfying.
> John Doe wrote:
>> See the bottom of this post for pictures. If you look closely, you
>> can see the power supply fan wires in one of those pictures.
>>
>> I bought a legacy server with a 560 W power supply. It's dual fans
>> are too loud, apparently running 100% speed all the time. Might be
>> okay for flight simulation immersion, but No.
>>
>> I suppose the easiest solution would be to put a resistor in series
>> with the power leads.
>>
>> Another possibility would be to sever all but the sensor leads. And
>> connect the two power supply leads to the motherboard fan
>> controllers. Apparently the motherboard has settings for different
>> fan voltages at the fan outputs, and doesn't care about system
>> temperature.
>>
>> But the power supply needs to know that the fans are running, or it
>> shuts down the system. I suspect that slowing the fans would produce
>> a fault, just like removing the fans does. Do the sensors look for a
>> fan speed of at least a certain RPM? I guess so, just double
>> checking.
>>
>> How difficult might it be to determine and satisfy what signals the
>> power supply controller is looking for from the three wire fans?
>>
>> Ideally, I would like to replace the power supply fan with a system
>> board fan. But those power supply fan connectors need satisfying.
> For a Dell poweredge 2950, I added three parallel 100 ohms 1/4W
> resistors to the PS fan and two of the four box fans, while removing
> the other two fans and one CPU. The noise level is substantially
> lower, as well as the power bill. That was six months ago and the
> server is still up since then.
Being interested in power consumption, I ordered a "kill-o-watt" power
> resistors to the PS fan and two of the four box fans, while removing
> the other two fans and one CPU. The noise level is substantially
> lower, as well as the power bill. That was six months ago and the
> server is still up since then.
meter to go with the server (and other things). Some gamers spend $100+ on
a 1000 W power supply while having no real idea what their system actually
consumes. I had one before, but I think someone else is using it now.
Thanks for the real suggestions.
Wayne Chirnside
Feb 7, 2016, 1:35:14 PM2/7/16
to
On Sun, 07 Feb 2016 15:55:59 +0000, John Doe wrote:
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
>
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
>
> Another possibility would be to sever all but the sensor leads. And
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does. Do the sensors look for a fan
> speed of at least a certain RPM? I guess so, just double checking.
>
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
>
> Ideally, I would like to replace the power supply fan with a system
> board fan. But those power supply fan connectors need satisfying.
>
> Thanks.
5 watt 3 volt zener diode for 12 volt fans,
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
>
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
>
> Another possibility would be to sever all but the sensor leads. And
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does. Do the sensors look for a fan
> speed of at least a certain RPM? I guess so, just double checking.
>
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
>
> Ideally, I would like to replace the power supply fan with a system
> board fan. But those power supply fan connectors need satisfying.
>
> Thanks.
Higher current, zener - transistor base to emitter with 1k resistor.
Did that for my Pentium someone dropped a server fan in, also too much
noise.
John Larkin
Feb 7, 2016, 2:08:16 PM2/7/16
to
On Sun, 07 Feb 2016 18:35:05 GMT, Wayne Chirnside <fr...@fuax.com>
wrote:
LM1117 and a trimpot?
Or something with a thermistor!
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
wrote:
Or something with a thermistor!
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
John Doe
Feb 7, 2016, 2:15:46 PM2/7/16
to
John Larkin <jjla...@highlandtechnology.com> wrote:
Thing is, the power supply fan controller will shut down the power
supply if it detects something wrong with the fan. I don't know exactly
what it looks for, but it won't operate if the fan is unplugged. I
suspect it requires the fan RPM to be at least a certain value. Would be
great to know. The need to research it harder. Just putting something on
those inputs could work. Maybe (just maybe) even if I have to make a
timer circuit for it.
supply if it detects something wrong with the fan. I don't know exactly
what it looks for, but it won't operate if the fan is unplugged. I
suspect it requires the fan RPM to be at least a certain value. Would be
great to know. The need to research it harder. Just putting something on
those inputs could work. Maybe (just maybe) even if I have to make a
timer circuit for it.
John Larkin
Feb 7, 2016, 2:29:56 PM2/7/16
to
rotation sensor signal would still work. Try it!
You could fake the sensor signal, but that's more work.
John Doe
Feb 7, 2016, 2:40:59 PM2/7/16
to
>>>>5 watt 3 volt zener diode for 12 volt fans, Higher current, zener -
>>>>transistor base to emitter with 1k resistor. Did that for my Pentium
>>>>someone dropped a server fan in, also too much noise.
>>>
>>> LM1117 and a trimpot?
>>>
>>> Or something with a thermistor!
>>
>>Thing is, the power supply fan controller will shut down the power
>>supply if it detects something wrong with the fan. I don't know
>>exactly what it looks for, but it won't operate if the fan is
>>unplugged. I suspect it requires the fan RPM to be at least a certain
>>value. Would be great to know. The need to research it harder. Just
>>putting something on those inputs could work. Maybe (just maybe) even
>>if I have to make a timer circuit for it.
>
> I'm guessing that you could throttle down the fan voltage and the
> rotation sensor signal would still work. Try it!
Seems like this would be the easiest way to try...
>>>>transistor base to emitter with 1k resistor. Did that for my Pentium
>>>>someone dropped a server fan in, also too much noise.
>>>
>>> LM1117 and a trimpot?
>>>
>>> Or something with a thermistor!
>>
>>Thing is, the power supply fan controller will shut down the power
>>supply if it detects something wrong with the fan. I don't know
>>exactly what it looks for, but it won't operate if the fan is
>>unplugged. I suspect it requires the fan RPM to be at least a certain
>>value. Would be great to know. The need to research it harder. Just
>>putting something on those inputs could work. Maybe (just maybe) even
>>if I have to make a timer circuit for it.
>
> I'm guessing that you could throttle down the fan voltage and the
> rotation sensor signal would still work. Try it!
First, check an unused system board fan output to see if the voltage is
reduced like it is on the used fan outputs, given a BIOS setting. If so,
connect the noisy power supply fan supply leads to a system board fan
output, but connect its signal wire back to the power supply signal
input. That assumes the power supply doesn't also sense whether current
is being drawn by the fan. But sensing RPMs is probably enough.
> You could fake the sensor signal, but that's more work.
ground pins.
John Doe
Feb 7, 2016, 2:47:15 PM2/7/16
to
finishing the rest of my experiment with the legacy dual CPU six channel
memory server. That is modding into it a GTX 960 video card, to see if
it outperforms similarly priced end-user PCs. I'll put up with the noise
for a few days.
tabb...@gmail.com
Feb 7, 2016, 3:12:33 PM2/7/16
to
NT
DecadentLinuxUserNumeroUno
Feb 7, 2016, 3:20:54 PM2/7/16
to
On Sun, 07 Feb 2016 12:12:29 -0800, tabbypurr wrote:
snip
computer store.
The cost savings in personal time alone should be Yuge!
Unless your personal time is worth the same as that of a Russian street
sweeper.
Such lack of logic these days.
snip
>>
>> https://www.flickr.com/photos/27532210@N04/24781725611/in/dateposted/
>>
>> That's the power supply, plus two other pictures. It's supposed to be
>> used but I see zero signs of use.
>>
>> http://www.ebay.com/itm/371543511693?
>>
>> That's where I bought it. If you need something like that, don't
>> hesitate. But be advised that I don't sell anything.
>
> the other option is to add damping & baffles
>
>
Sheesh... Just go buy a couple of fans with speed controls at the
>> https://www.flickr.com/photos/27532210@N04/24781725611/in/dateposted/
>>
>> That's the power supply, plus two other pictures. It's supposed to be
>> used but I see zero signs of use.
>>
>> http://www.ebay.com/itm/371543511693?
>>
>> That's where I bought it. If you need something like that, don't
>> hesitate. But be advised that I don't sell anything.
>
> the other option is to add damping & baffles
>
>
computer store.
The cost savings in personal time alone should be Yuge!
Unless your personal time is worth the same as that of a Russian street
sweeper.
Such lack of logic these days.
kevin93
Feb 7, 2016, 3:47:03 PM2/7/16
to
On Sunday, February 7, 2016 at 7:58:59 AM UTC-8, John Doe wrote:
...
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
...
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
Have you checked the BIOS settings?
When I replaced the motherboard on one of my desktops the fans always ran at 100% - that was the default BIOS setting although it did have the ability to manage the fans depending upon CPU temperature.
With the revised settings the fans only run at ~20% out of the time.
kevin
whit3rd
Feb 7, 2016, 3:47:46 PM2/7/16
to
On Sunday, February 7, 2016 at 7:58:59 AM UTC-8, John Doe wrote:
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time....
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
Alas, that's not a good idea. Server CPU heatsink capacity is well
> the power leads.
engineered, you probably need that fan making turbulent airflow
(i.e. running noisy) to cool the parts.
Your only quiet option might be to fit liquid cooling, and use
a very large radiator outside the box. That is a 1U (skinny)
box, you won't fit a quiet-fan cooler inside it.
John Doe
Feb 7, 2016, 6:00:14 PM2/7/16
to
The power supply won't function without its own fans providing feedback.
Go back to sweeping streets...
--
DecadentLinuxUserNumeroUno <DLU1 DecadentLinuxUser.org> wrote in news:n988ut$tmo$1 gioia.aioe.org:
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> From: DecadentLinuxUserNumeroUno <DLU1 DecadentLinuxUser.org>
> Newsgroups: sci.electronics.design
> Subject: Re: How to reduce server power supply fan noise?
> Date: Sun, 7 Feb 2016 20:20:45 +0000 (UTC)
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Go back to sweeping streets...
--
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> From: DecadentLinuxUserNumeroUno <DLU1 DecadentLinuxUser.org>
> Newsgroups: sci.electronics.design
> Subject: Re: How to reduce server power supply fan noise?
> Date: Sun, 7 Feb 2016 20:20:45 +0000 (UTC)
> Organization: Aioe.org NNTP Server
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> On Sun, 07 Feb 2016 12:12:29 -0800, tabbypurr wrote:
>
> snip
>>>
>>> https://www.flickr.com/photos/27532210 N04/24781725611/in/dateposted/
> On Sun, 07 Feb 2016 12:12:29 -0800, tabbypurr wrote:
>
> snip
>>>
John Doe
Feb 7, 2016, 6:01:29 PM2/7/16
to
kevin93 <ke...@whitedigs.com> wrote:
> John Doe wrote:
> ...
>> I bought a legacy server with a 560 W power supply. It's dual fans are
>> too loud, apparently running 100% speed all the time. Might be okay for
>> flight simulation immersion, but No.
> ...
>
> Have you checked the BIOS settings?
Yes, but they don't affect the PSU fans.
> John Doe wrote:
> ...
>> I bought a legacy server with a 560 W power supply. It's dual fans are
>> too loud, apparently running 100% speed all the time. Might be okay for
>> flight simulation immersion, but No.
> ...
>
> Have you checked the BIOS settings?
--
John Doe
Feb 7, 2016, 6:12:48 PM2/7/16
to
whit3rd <whi...@gmail.com> wrote:
> John Doe wrote:
>
>> I bought a legacy server with a 560 W power supply. It's dual fans
>> are too loud, apparently running 100% speed all the time.... I
>> suppose the easiest solution would be to put a resistor in series
>> with the power leads.
>
> Alas, that's not a good idea.
Okay.
> John Doe wrote:
>
>> I bought a legacy server with a 560 W power supply. It's dual fans
>> are too loud, apparently running 100% speed all the time.... I
>> suppose the easiest solution would be to put a resistor in series
>> with the power leads.
>
> Alas, that's not a good idea.
> Server CPU heatsink capacity is well engineered, you probably need
> that fan making turbulent airflow (i.e. running noisy) to cool the
> parts.
> Your only quiet option might be to fit liquid cooling, and use a very
> large radiator outside the box. That is a 1U (skinny) box, you
> won't fit a quiet-fan cooler inside it.
an ordinary PC power supply with a large and quiet fan. Many of them do
over 560 W.
Modern video card fans using heat pipes don't even spin up until they
are under stress, like when gaming.
--
Thanks to the replies/suggestions. I'll hopefully get back to it later.
Clifford Heath
Feb 7, 2016, 6:15:20 PM2/7/16
to
In addition to all the helpful responses about how to slow the fans down...
On 08/02/16 02:55, John Doe wrote:
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time.
Servers tend to be made slim so they can be stacked & racked, and that
means they use small diameter fans, with noisy ball-bearings for
longevity, that run at high speed to move enough air.In short, they scream.
If you have the option of fitting larger diameter fans, you'll find them
much quieter in general.
Clifford Heath.
On 08/02/16 02:55, John Doe wrote:
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time.
means they use small diameter fans, with noisy ball-bearings for
longevity, that run at high speed to move enough air.In short, they scream.
If you have the option of fitting larger diameter fans, you'll find them
much quieter in general.
Clifford Heath.
DecadentLinuxUserNumeroUno
Feb 7, 2016, 6:41:06 PM2/7/16
to
On Sun, 07 Feb 2016 22:57:15 +0000, John Doe wrote:
> The power supply won't function without its own fans providing feedback.
> Go back to sweeping streets...
Learn how to properly quote you retarded Usenet dumbfuck.
> The power supply won't function without its own fans providing feedback.
> Go back to sweeping streets...
Variable speed fans have rpm output leads, idiot.
You are not even qualified to sweep streets. Goddamned crossposting
retarded fuck too.
DecadentLinuxUserNumeroUno
Feb 7, 2016, 6:43:01 PM2/7/16
to
On Sun, 07 Feb 2016 23:09:52 +0000, John Dope wrote:
> From: John Dope <alway...@message.header>
John Dope Always a total retard.
> From: John Dope <alway...@message.header>
John Dope Always a total retard.
Ecnerwal
Feb 7, 2016, 10:53:14 PM2/7/16
to
In article <bae9acd8-1a7b-45c9...@googlegroups.com>,
Yep, I have an MDF & foam box I wrapped a 1U server in a long time ago
since it was too darn loud even in a closet. Basically an S with the
server in the middle, it knocked off enough of the irritating
high-frequency noise to make the thing bearable.
But.
The best solution by far is to ditch the rack server and buy a tower
server - those are often actually optimized for sound and power
consumption while rack servers basically never are. In many cases the
power bills (especially if you run AC part of the year and they also add
to your cooling load) from an old rack server will rather quickly exceed
the cost of an equivalent-computing-power tower server.
That didn't happen to be an option for the 1U server I built the box for
- but whenever it is an option, it's the better option, unless you are
in fact trying to cram all the computer power you can into the minimum
amount of space, and are happy to pay for the resulting power and
cooling (more power) costs, and don't care how loud the server room is.
In which case you won't be buying legacy servers, you'd be selling them
off...
--
Cats, coffee, chocolate...vices to live by
Please don't feed the trolls. Killfile and ignore them so they will go away.
Yep, I have an MDF & foam box I wrapped a 1U server in a long time ago
since it was too darn loud even in a closet. Basically an S with the
server in the middle, it knocked off enough of the irritating
high-frequency noise to make the thing bearable.
But.
The best solution by far is to ditch the rack server and buy a tower
server - those are often actually optimized for sound and power
consumption while rack servers basically never are. In many cases the
power bills (especially if you run AC part of the year and they also add
to your cooling load) from an old rack server will rather quickly exceed
the cost of an equivalent-computing-power tower server.
That didn't happen to be an option for the 1U server I built the box for
- but whenever it is an option, it's the better option, unless you are
in fact trying to cram all the computer power you can into the minimum
amount of space, and are happy to pay for the resulting power and
cooling (more power) costs, and don't care how loud the server room is.
In which case you won't be buying legacy servers, you'd be selling them
off...
--
Cats, coffee, chocolate...vices to live by
Please don't feed the trolls. Killfile and ignore them so they will go away.
Jasen Betts
Feb 7, 2016, 11:01:08 PM2/7/16
to
an ATX powersupply won't fit.
--
\_(ツ)_
Jasen Betts
Feb 7, 2016, 11:01:08 PM2/7/16
to
On 2016-02-07, John Doe <alway...@message.header> wrote:
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
We dubber a server we installed in 2007 "Concorde" because of the
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
noise it made and the wind,
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
+5, just much quieter, and less windy.
> Another possibility would be to sever all but the sensor leads. And
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does. Do the sensors look for a fan
> speed of at least a certain RPM? I guess so, just double checking.
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
pulses on the yellow wire one pulse per cycle of the fan motor
and ground being the black wire.
You could solve this with a 555 or go all out and make a PLL to
multiply the speed.
--
\_(ツ)_
Jasen Betts
Feb 7, 2016, 11:01:10 PM2/7/16
to
tabs on the switching transistors are live, usually the heatsink
is too.
--
\_(ツ)_
John Doe
Feb 8, 2016, 3:42:19 AM2/8/16
to
V.
> You could solve this with a 555
Then a large fan can be funneled to the power supply. I just need to
satisfy/disable those power supply fan inputs.
John Doe
Feb 8, 2016, 3:51:17 AM2/8/16
to
I wrote:
> First, check an unused system board fan output to see if the voltage
> is reduced like it is on the used fan outputs, given a BIOS setting.
Nope. Apparently four pin fan speed is controlled by the blue wire that
> First, check an unused system board fan output to see if the voltage
> is reduced like it is on the used fan outputs, given a BIOS setting.
ranges from 1.65 to over 5 V. The red V+ wire remains 12 V.
But I can try by connecting those two fans to a 5 V supply with their
signal pins heading back to the power supply. Later.
DecadentLinuxUserNumeroUno
Feb 8, 2016, 4:22:32 AM2/8/16
to
It took me exactly ten seconds.
http://tinyurl.com/jrvdlkz
Brainless blunder
John Doe
Feb 8, 2016, 4:33:42 AM2/8/16
to
https://www.flickr.com/photos/27532210@N04/24579652650/in/photostream/
Looking at the two 3 pin fan connectors on the lower left.
The leftmost connector.
From right to left.
Black is ground. Red is 12 V. Apparently yellow is the return signal wire.
The right connector.
Same orientation, from right to left.
Gray is ground. Orange is 12 V. Apparently purple is the return signal
wire.
Looking at the two 3 pin fan connectors on the lower left.
The leftmost connector.
From right to left.
Black is ground. Red is 12 V. Apparently yellow is the return signal wire.
The right connector.
Same orientation, from right to left.
Gray is ground. Orange is 12 V. Apparently purple is the return signal
wire.
DecadentLinuxUserNumeroUno
Feb 8, 2016, 4:54:13 AM2/8/16
to
On Mon, 08 Feb 2016 08:48:20 +0000, John Doe wrote:
> I wrote:
>
>> First, check an unused system board fan output to see if the voltage is
>> reduced like it is on the used fan outputs, given a BIOS setting.
>
> Nope. Apparently four pin fan speed is controlled by the blue wire that
> ranges from 1.65 to over 5 V. The red V+ wire remains 12 V.
It is zero to 3.3 volts PWM.
>
>> First, check an unused system board fan output to see if the voltage is
>> reduced like it is on the used fan outputs, given a BIOS setting.
>
> Nope. Apparently four pin fan speed is controlled by the blue wire that
> ranges from 1.65 to over 5 V. The red V+ wire remains 12 V.
Finding info about four conductor fans was a simple google search.
Don't look for pages to visit look for images and see a whole page full
of schematics, explanations, links, etc.
Sheesh.
>
> But I can try by connecting those two fans to a 5 V supply with their
> signal pins heading back to the power supply. Later.
succeed in your goal.
You take pathetic to an all new low.
DecadentLinuxUserNumeroUno
Feb 8, 2016, 5:11:00 AM2/8/16
to
John Doe
Feb 8, 2016, 5:52:52 AM2/8/16
to
Using 5 V (as someone suggested) works. Very quiet, could be higher
voltage (if there were some intermediate supply voltage between 5 and 12
V).
Simple to test.
Just cut the two fan-connector V+ wires (see the picture and description
below) and connect the fan side of those wires to a 5 V floppy power
connector. Leaving the ground and signal wires untouched and connected.
So, Yes, all that matters is the power supply fan feedback signal be
present. Doesn't require the fan spinning at full 12 V speed. I guess
it's just that cheap, thankfully.
Should work while my room is cool, at least long for my purpose. I'll
regularly test the air (temperature) coming out of it.
OF COURSE THIS ISN'T WHAT IT WAS DESIGNED FOR AND COULD CAUSE A FIRE.
Don't try this at home.
--
Thanks to the replies.
voltage (if there were some intermediate supply voltage between 5 and 12
V).
Simple to test.
Just cut the two fan-connector V+ wires (see the picture and description
below) and connect the fan side of those wires to a 5 V floppy power
connector. Leaving the ground and signal wires untouched and connected.
So, Yes, all that matters is the power supply fan feedback signal be
present. Doesn't require the fan spinning at full 12 V speed. I guess
it's just that cheap, thankfully.
Should work while my room is cool, at least long for my purpose. I'll
regularly test the air (temperature) coming out of it.
OF COURSE THIS ISN'T WHAT IT WAS DESIGNED FOR AND COULD CAUSE A FIRE.
Don't try this at home.
--
Thanks to the replies.
DecadentLinuxUserNumeroUno
Feb 8, 2016, 6:11:05 AM2/8/16
to
On Mon, 08 Feb 2016 10:49:54 +0000, John Doe wrote:
> Using 5 V (as someone suggested) works. Very quiet, could be higher
> voltage (if there were some intermediate supply voltage between 5 and 12
> V).
>
> Simple to test.
>
> Just cut the two fan-connector V+ wires (see the picture and description
> below) and connect the fan side of those wires to a 5 V floppy power
> connector. Leaving the ground and signal wires untouched and connected.
>
> So, Yes, all that matters is the power supply fan feedback signal be
> present. Doesn't require the fan spinning at full 12 V speed. I guess
> it's just that cheap, thankfully.
>
> Should work while my room is cool, at least long for my purpose. I'll
> regularly test the air (temperature) coming out of it.
>
> OF COURSE THIS ISN'T WHAT IT WAS DESIGNED FOR AND COULD CAUSE A FIRE.
>
> Don't try this at home.
Anything but the right way, eh?
> Using 5 V (as someone suggested) works. Very quiet, could be higher
> voltage (if there were some intermediate supply voltage between 5 and 12
> V).
>
> Simple to test.
>
> Just cut the two fan-connector V+ wires (see the picture and description
> below) and connect the fan side of those wires to a 5 V floppy power
> connector. Leaving the ground and signal wires untouched and connected.
>
> So, Yes, all that matters is the power supply fan feedback signal be
> present. Doesn't require the fan spinning at full 12 V speed. I guess
> it's just that cheap, thankfully.
>
> Should work while my room is cool, at least long for my purpose. I'll
> regularly test the air (temperature) coming out of it.
>
> OF COURSE THIS ISN'T WHAT IT WAS DESIGNED FOR AND COULD CAUSE A FIRE.
>
> Don't try this at home.
Yeranidiot.
John Doe
Feb 8, 2016, 8:13:27 AM2/8/16
to
Go play on the autobahn, nym-shifting troll...
--
DecadentLinuxUserNumeroUno <DLU1 DecadentLinuxUser.org> wrote in news:n99t43$v7s$1 gioia.aioe.org:
> Path: eternal-september.org!mx02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail
> From: DecadentLinuxUserNumeroUno <DLU1 DecadentLinuxUser.org>
> Newsgroups: sci.electronics.design
> Subject: Re: How to reduce server power supply fan noise?
> Date: Mon, 8 Feb 2016 11:10:59 +0000 (UTC)
> References: <n97pef$eln$1 dont-email.me> <n99n84$n6a$1 dont-email.me> <n99rsi$8ck$1 dont-email.me>
--
DecadentLinuxUserNumeroUno <DLU1 DecadentLinuxUser.org> wrote in news:n99t43$v7s$1 gioia.aioe.org:
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> From: DecadentLinuxUserNumeroUno <DLU1 DecadentLinuxUser.org>
> Newsgroups: sci.electronics.design
> Subject: Re: How to reduce server power supply fan noise?
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DecadentLinuxUserNumeroUno
Feb 8, 2016, 8:29:27 AM2/8/16
to
On Mon, 08 Feb 2016 13:10:29 +0000, John Doe wrote:
> Go play on the autobahn, nym-shifting troll...
Same exact nym for three years, retarded crossposting Usenet dumbfuck.
> Go play on the autobahn, nym-shifting troll...
Jon Elson
Feb 8, 2016, 3:18:29 PM2/8/16
to
John Doe wrote:
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does.
Probably not, as long as you don't slow them down too much. I usually put a
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does.
couple diodes in series with the +5 or +12 V wire, that drops the speed a
bit.
Jon
John Doe
Feb 8, 2016, 6:17:27 PM2/8/16
to
Jon Elson <jme...@wustl.edu> wrote:
> John Doe wrote:
>
>> But the power supply needs to know that the fans are running, or it
>> shuts down the system. I suspect that slowing the fans would produce
>> a fault, just like removing the fans does.
>
> Probably not, as long as you don't slow them down too much.
Already proved, the feedback is acceptable to the power supply even when
> John Doe wrote:
>
>> But the power supply needs to know that the fans are running, or it
>> shuts down the system. I suspect that slowing the fans would produce
>> a fault, just like removing the fans does.
>
> Probably not, as long as you don't slow them down too much.
the fan is powered by only 5 V (down from 12).
> I usually put a couple diodes in series with the +5 or +12 V wire,
> that drops the speed a bit.
andreas...@gmail.com
Jul 7, 2018, 10:49:56 PM7/7/18
to
On Sunday, February 7, 2016 at 10:58:59 AM UTC-5, John Doe wrote:
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
>
> See the bottom of this post for pictures. If you look closely, you can
> see the power supply fan wires in one of those pictures.
>
> I bought a legacy server with a 560 W power supply. It's dual fans are
> too loud, apparently running 100% speed all the time. Might be okay for
> flight simulation immersion, but No.
>
> I suppose the easiest solution would be to put a resistor in series with
> the power leads.
>
> the power leads.
>
> Another possibility would be to sever all but the sensor leads. And
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> connect the two power supply leads to the motherboard fan controllers.
> Apparently the motherboard has settings for different fan voltages at
> the fan outputs, and doesn't care about system temperature.
>
> But the power supply needs to know that the fans are running, or it
> shuts down the system. I suspect that slowing the fans would produce a
> shuts down the system. I suspect that slowing the fans would produce a
> fault, just like removing the fans does. Do the sensors look for a fan
> speed of at least a certain RPM? I guess so, just double checking.
>
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
>
> Ideally, I would like to replace the power supply fan with a system
> speed of at least a certain RPM? I guess so, just double checking.
>
> How difficult might it be to determine and satisfy what signals the
> power supply controller is looking for from the three wire fans?
>
> board fan. But those power supply fan connectors need satisfying.
>
> Thanks.
>
>
>
>
> --
>
> https://www.flickr.com/photos/27532210@N04/24781725611/in/dateposted/
>
> That's the power supply, plus two other pictures. It's supposed to be
> used but I see zero signs of use.
>
> http://www.ebay.com/itm/371543511693?
>
> That's where I bought it. If you need something like that, don't
> hesitate. But be advised that I don't sell anything.
I have figured it out , what I id was take an older fan with way bigger blade ,, I did a little fan mod I put the bigger lade on the little psu fan and like magic works perfectly. but keep in mind you do still need to keep the psu cooled, so just mount anouther fan on the psu with the case open . make it fit.
> That's the power supply, plus two other pictures. It's supposed to be
> used but I see zero signs of use.
>
> http://www.ebay.com/itm/371543511693?
>
> That's where I bought it. If you need something like that, don't
> hesitate. But be advised that I don't sell anything.
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