ATX cooling fans
Lutrell
drive would get very hot so I opened the front slots a little more to flow
air. This new ATX case has vent holes in the front and slots along the side
near the bottom. Anyway I was wondering if the power supply fan suppose to
blow in or out the case. Also when I asked the computer store technician
which way the fans blow he looked at the front fan and saw it was blowing
out and then turned it around to blow in. Does this seem right? And if heat
goes up then wouldn't you want the PS fan to blow out from the top?
Lutrell :-)
John Mitchell
yes - it should blow out. Get it exchanged.
John Mitchell
Richard
> ATX specifications (beginning with 2.01?) call for the power supply
> fan to blow air INTO the case, rather than suck air OUT. Intel's
> switch of specifications has caused some controversy. Some say that
> having the PS fan blowing air OUT of the case cools the case better
> because warm air rises. Others say the new specification allows for
> cheaper manufacturing costs since the PS fan pulls air INTO the case
> and blows it right onto the CPU and MB, and that it cools just as well
> or better than out-blowing supplies. A recent post listed benifits of
> cases using "positive pressure" (or IN-blowing case fans), one of
> which was that you could remove the covers of adjacent PCI slots so
> that the out-rush of air would cool a specific card.
>
> The most convincing evidence so far seems to be in favor of power
> supply fans that blow air OUT of the case. Many of its proponents
> (call them "outies?") have tried it both ways and say that OUT blowing
> PS fans result in cooler systems. I've seen posts by people who have
> even taken their power supplies apart and physically reversed the fan
> inside to achieve this. And besides, it is more logical to set the
> front-bottom case fan to pull air INTO the case (and over the MB and
> CPU) which then heats up and rises, and the PS fan picks it up and
> blows it OUT ouf the case.
>
> But notice that I haven't given any evidence of my own. Like you,
> I plan on assembling an ATX system and I've just been following this
> subject closely for a while. Especially since I plan to overclock, I
> want as cool a system as possible. Once I get my system assembled, I
> will find out for myself.
My current favorite runs a PII333@4x100 w/sound, modem, video capture,
FM radio, Maxtor Diamond Max, 36x CD, tape, 3.5, int ZIP, 300Watt ps in
an Inwin500 box with two fans - 80cm - ps and aux - filtered and
inflowing. The temp hovers between 32-35c. I have fiddled with other
fans and tried reversing the auxillary fan to outflow - I have not tried
reversing both. No arrangement/configs produced lower temps. Since
there is nothing wrong with this temp range, I've lost interest in
further experimentation.
>
> NBates
Lutrell
testing the temp in my case. With just the desktop showing I get 94.1 deg F
(34.5C). My power supply fan is blowing in and so is the front panel fan. I
dont have any filters on my fans. I Also tested the chips on my Monster 3D 2
card by taping the sensor to one. With just the desktop view I its at
108.2F, with 3d screen saver its about 115F, when I play a the game Unreal
it goes up to 145 deg. F! I installed a Stealth V2 fan and then it went down
to 115F. Then I connected another M3d 2 card with a fan in SLI mode and the
temp went up to 127F on the card and 96.1 in the case. I think there is less
air flow with the tight space between the cards. I tried putting another
small fan blowing at the cards but it actually got a few deg hotter. I think
I need to pull air from the cards and blow air out the case. I dont know how
what the max temp is for the video chips but I would like to keep it as cool
as possible. On my older computer I opened up the vent for more air flow but
then it was too loud so I put a filter on it and it didn't take long before
the filter was full of dust.
Lutrell :-)
Norman Bates wrote in message <366039e...@news.mindspring.com>...
>Richard <r.l.th...@bigfoot.com> wrote:
>>
> NBates
TeamEuroMeko
_____________________________________________
EuroMeko Computer Solutions, Inc.
exclusive support for small office/home office
909-988-0257 - http://euromeko.cnchost.com
Lutrell wrote in message ...
Richard
>
> Richard <r.l.th...@bigfoot.com> wrote:
> >
> > My current favorite runs a PII333@4x100 w/sound, modem, video capture,
> > FM radio, Maxtor Diamond Max, 36x CD, tape, 3.5, int ZIP, 300Watt ps in
> > an Inwin500 box with two fans - 80cm - ps and aux - filtered and
> > inflowing. The temp hovers between 32-35c. I have fiddled with other
> > fans and tried reversing the auxillary fan to outflow - I have not tried
> > reversing both. No arrangement/configs produced lower temps. Since
> > there is nothing wrong with this temp range, I've lost interest in
> > further experimentation.
>
> case fan filters. Do they impede the airflow to any noticeable
> degree?
You could easily induce drag by choosing an inappropriate filter. I
experimented with paper air filters ment for air intakes to auto
engines. Clearly, you would not dismantle these filters and flatten the
paper over the intake holes of your case as this would restrict the flow
severely. I suspect that the pleated config would do ok, but the
housings of such filters are unitized and very tough to modify.
I settled on an electrostatic home-vent filter. It was easy to modify
and maintain integrity of seals at the edges and at case contact plus -
they're washable/reuseable. Mind, this is not the 'powered' sort and
relies only on material composition, chemical coatings and static
produced by the air flow to attract particulates.
> My case does not have a built-in filter for the auxillary
> fan, but I have seen some that do and I have thought about rigging
> something up. Also, do you think it would be worth it? Does it
> reduce dust build-up on internal components?
To date, there is no discoloration at the feathered edges of the fan
blades nor in the convolutions of the heat sink of the CPU; which I take
to mean the filter is working - but it has not yet been a full year of
operation and it remains to be seen what happens during the pollination
season.
Is it worth it? Sure. You know that you will feel the need to clean
everything if you spot all your components decked out in little furry
bunny suits - that can take a full afternoon - so, preventative
maintenance is the way to go.
>
> NBates
Richard
>
> I bought a $10.00 Indoor/Outdoor tamp gauge from Radio Shack and have been
> testing the temp in my case. With just the desktop showing I get 94.1 deg F
> (34.5C). My power supply fan is blowing in and so is the front panel fan. I
> dont have any filters on my fans. I Also tested the chips on my Monster 3D 2
> card by taping the sensor to one. With just the desktop view I its at
> 108.2F, with 3d screen saver its about 115F, when I play a the game Unreal
> it goes up to 145 deg. F! I installed a Stealth V2 fan and then it went down
> to 115F. Then I connected another M3d 2 card with a fan in SLI mode and the
> temp went up to 127F on the card and 96.1 in the case. I think there is less
> air flow with the tight space between the cards.
this obsevation is entirely correct - a channel effect. In essense, the
convection forces create an 'oven' that rapidly heats inbound air and
negates cooling.
Injecting air between the cards with a squirrel-cage blower (powered via
the ps, not the motherboard) or using one of the ducted slot-fans would
disperse the heat. Opening an intervening slot would lessen case
pressure - increase flow - but would not do as well as aux fans since
the outflow would not be directed wholly over the card surface.
Andy...@nospam.see.sig.co.uk
this, CPU Cooler and 80mm fan at the front of the case blowing in
average CPU temp (PII 400) was 42c. Opened PSU reversed fan blowing
outwards and the average CPU temp dropped to 36c. These were running
NT. Under 95/98 average temp at the moment is 46c . For explanation of
this have a look at http://cpu.simplenet.com/leading_wintech/ who do
Rain and Waterfall Pro coolers for the CPU.
Intel state that 70c is max for a PII300 so have not installed Rain on
my Workstation but have bought Waterfall Pro from them for my laptop
and it runs noticeable cooler.
Andy
"Lutrell" <ds...@NOSPAMinreach.com> wrote:
>I got a new custom P2 system with an ATX case. With my old system the hard
>drive would get very hot so I opened the front slots a little more to flow
>air. This new ATX case has vent holes in the front and slots along the side
>near the bottom. Anyway I was wondering if the power supply fan suppose to
>blow in or out the case. Also when I asked the computer store technician
>which way the fans blow he looked at the front fan and saw it was blowing
>out and then turned it around to blow in. Does this seem right? And if heat
>goes up then wouldn't you want the PS fan to blow out from the top?
>Lutrell :-)
>
To send me a real message use jz94 @ dial.pipex.com
Any Spam,UCE,Junk Mail will be traced and reported
to all the upstream providers.