The BIOS allows for changes to:
Overclock mode: Auto, CPU,PCIE Sync or Async
CPU Freq: 200-500MHz
PCIE Freq: 70-150MHz
Boot Failure guard: Enabled/Disabled
Spread Spectrum: Auto/Disabled
Ratio Actual Value is locked on 10x
Enhanced Halt State:Disabled/Enabled
Max CPUID Value Limit: Disabled/Enabled
CPU Thermal Throttling: Disabled/Enabled
Intel SpeedStep: Auto/Enabled/Disabled
DRAM Freq: AUTO/266/333
Flexibility Option: Disabled/Enabled
Config DRAM Timing by SPD: Enabled/Disabled
PCI Fix Function: Enabled/Didabled
VCCM Voltage: Auto/High/Middle/Low
VDDQ Voltage: Auto/High/Low
I have tried stepping the CPU Freq from 200 to 326MHz under Auto, and
Async. Nothing above 210MHz works. I can't believe that this E4400 is
Any help in getting the config settings right to boot to 2.6GHz would
be much appreciated.
Is this your board? You didn't mention a model number.
Got jumpers like that? What does CPU-Z say about your bus
speeds (memory, PCI-E) when the CPU frequency is at 210 MHz?
You haven't given information on
CPU temperature (loaded and idle)
System temperature (loaded and idle)
Room ambient temperature
CPU core voltage
Memory timing parameters
Read the posts in this newsgroup. Read your motherboard manual. Post
None of the parameters you list are all that critical to overclocking.
Without more information, and without reading your motherboard manual, I can
only guess at proper settings. But I can tell you this, it's NOT the CPU.
It's the settings you chose, or the settings that your motherboard does not
offer, or the CPU temperature that's the problem.
<stev...@email.com> wrote in message
You have DDR2-533 RAM. The instant you start to overclock the core,
the memory frequency goes up too. You need RAM with a bit more
room to maneuver. If you had DDR2-667 RAM, you could dial the
BIOS setting to DDR2-533, and then increase the core by 667/533=1.25x
or a 25% overclock. Once the CPU is getting 250 instead of 200, that
is a 25% increase in frequency. The memory, even though it shows
DDR2-533 in the BIOS, would actually be running at DDR2-667.
By dropping the CPU multiplier, you can test the CPU, presumably
under a set of conditions that are not taxing the processor. You
can use such a test, to verify the memory has "headroom" above its
stated DDR2-533 rating. DDR2 memory can be quite forgiving, and if
it hasn't been "binned" or sorted by operating frequency, it
may well operate above the stated rating. You'll need a Vdimm
voltage adjustment, to see how far the memory can be pushed. An applied
Vdimm over the nominal 1.8V would be required. A value like 2.0V
would be safe for your first experiment.
By either operating in memory limited, or CPU limited overclock
conditions, you should be able to figure out what is holding you
back. You'll need a memory test program (memtest86+), and
a non-corruptible OS like a Linux LiveCD to boot from, to do
stability testing. That way, your Windows disk won't get corrupted
while you're playing around. I have both Knoppix (knopper.net) and
Ubuntu (ubuntu.com), and either of those can be run straight from
a CD (no install on the hard drive needed). Then, I can download a
Linux version of Prime95 from mersenne.org, and use that to do a
100% CPU load test. If you can run Prime95 without errors reported,
then chances are it is safe to reboot into Windows.
> You have DDR2-533 RAM. The instant you start to overclock the core,
> the memory frequency goes up too. You need RAM with a bit more
> room to maneuver.
Actually, that CPU is a 200 MHz part, not 266 Mhz. If the ratio was at
1:1, there's be 66 Mhz headroom before the memory was being
There's not much the Asrock bios allows me to change. The CPU
Multiplier is locked at 10x. The manual has just 6 lines discussing
Untied Overclocking Technology. i.e. CPU/PCIE Sync v Async. Nothing
else. There doesn't appear to be any mobo jumpers to play with for
overclocking, just the Bios settings...
N.B. The cpu doesn't get much running as it doesn't POST. So temp
values are moot. Using standard cooling system that came with the CPU.
Asrock Conroe 1333-D667 Mobo with chipset Intel i945G/GZ Rev A2
Southbridge Intel 82801GB (ICH7/R)
Bios AMI P1.30 07/17/07
Factory settings are Auto, CPU Freq 200MHz. 100MHz PCIE. Core voltage
is 1.208v. At standard clock the cores are 41C, CPU 38C, according to
Speedfan. Ambient is 20C.
DRAM Freq 266MHz, FSB:DRAM 3:4, 4-4-4-12, PC2-5300 (333MHz) 1.8v
When I run at CPU Freq 210MHz in Sync mode CPUZ reports:
Core speed 2100.5 MHz, Bus 210 MHz, Rated FSB 840 MHz
DRAM Freq 280.1 MHz, FSB:DRAM 3:4, 4-4-4-12
And at CPU 220MHz:
Core speed 2201.5MHz, Bus 220.2MHz, Rated FSB 880.6MHz
DRAM Freq 293.5MHz, FSB:DRAM 3:4, 4-4-4-12
And at CPU 230MHz:
Core speed 2300.5MHz, Bus 230MHz, Rated FSB 920MHz
DRAM Freq 306.7MHz, FSB:DRAM 3:4, 4-4-4-12
Vcore 1.21v, Cores 43C, CPU 39C running SETI.
Looks like the RAM may be the cause of the problem as the CPU doesn't
POST past 240MHz. If so, what should the settings below be to permit
the RAM to overclock:
. Chipset Config:
>| DRAM Freq: AUTO/266/333
>| Flexibility Option: Disabled/Enabled
>| Config DRAM Timing by SPD: Enabled/Disabled
>| PCI Fix Function: Enabled/Disabled
>| VCCM Voltage: Auto/High/Middle/Low
>| VDDQ Voltage: Auto/High/Low
Your ideas please (other than buying some 667 RAM)?
OK, I downloaded the manual for ConRoe1333-D667 R2.0, and the manual
talks about DDR2-400 as a possible setting. You'd set your DDR2-533
RAM to DDR2-400, which would then leave room for the CPU overclock.
But the divider choices offered, are a function of FSB value, and
finding all the possible settings documented somewhere is difficult.
The datasheet for the chipset, for example, does not list the effect
of using the reserved register values, and it is also possible there
is an undocumented register that the motherboard makers know about.
So generally speaking, the BIOS is the best place to look, to see
what is actually available.
If it was my board, I would set the DRAM frequency as low as it would
go, to leave more headroom. I would also set the four timing numbers
for the RAM manually, to be consistent with the expected final DRAM
clock speed. (The reason that is important, is the BIOS recomputes
the four timing numbers, based on the user clock selection. Unless
you set the timing manually, the timing will be too tight, when the
elevated CPU clock is applied.)
You want to widen the timing a proportional amount. So, say the RAM
is 4-4-4-12 at DDR2-533, we're setting the RAM divider to DDR2-400,
CPU clock is going from 200 to 240, then a rough guess would be
4*(400/533)*(240/200) = 3.6, rounded up to next highest integer is 4.
What I forgot in this case, is the final RAM frequency is actually
below the rated speed. 400*(240/200) = DDR2-480, so the RAM timings
can be set manually to the rated values of 4-4-4-12. The thing is, if
left to its own devices, the BIOS would use 3-3-3 if it sees the divider
set to DDR2-400, and you want to set the timings to be consistent with
the final DDR2-480 value. So you still need to change "configure via SPD"
thing to [Manual}, and then put the 4-4-4-12 values in the individual
Say you went for an even higher overclock. Say 280MHz.
4*(400/533)*(280/200) = 4.2, round to next highest is 5, so 5-5-5-15 or so.
But for any of the above to be useful to you, there has to be a
DDR2-400 option offered in the BIOS. If the lowest offered is DDR2-533,
then you've got no headroom. In that case, you're overclocking the RAM
any time you go over nominal CPU clock, and the RAM has to be real good
to not get in the way.
| There's not much the Asrock bios allows me to change. The CPU
| Multiplier is locked at 10x. The manual has just 6 lines discussing
| Untied Overclocking Technology. i.e. CPU/PCIE Sync v Async. Nothing
| else. There doesn't appear to be any mobo jumpers to play with for
| overclocking, just the Bios settings...
As 'Fishface' posted, you need to post the exact model of your motherboard.
That should be silk-screened on the motherboard or at least should be in the
The most likely reason your system is not posting is that you have the
memory speed set MUCH to high.
What you need to do to get a reasonable overclock is to
RAISE the CPU clock (your motherboard will either offer a setting of 800 MHz
for the FSB speed or 200 MHz for the CPU clock. The FSB is quad-pumped, so
4 X 200 MHz = 800 MHz for your E4400.
You must set the Memory clock so that the memory is NOT overclocked.
Depending on your motherboard (I don't really want to read yet another
motherboard manual), this may require
specifically setting the memory clock to ASYNC ( the memory clock is not
synchronized to the FSB) and to DDR2-533
setting a CPU clock : Memory clock ratio that allows the memory to operate
at DDR2-533 specifications or slower.
THEN, after picking the correct alternative for your motherboard,
Set the CPU clock to 225 MHz or the FSB to 900 MHz, whichever is appropriate
for your motherboard.
Once you get a mild overclock like 225 MHz X 10 = 2.25 GHz, then you can try
to raise the FSB speed (CPU clock) by small increments, testing for
stability after EACH change.
As some point you may need to raise the CPU core voltage. But perhaps not.
I have an overclocked system I am using to post this message:
EVGA 680i motherboard
2 X 1 GByte Patriot DDR2-1066 memory;
The FSB speed is set to 1200 MHz, the Memory clock is set to 1200 MHz. For
this particular motherboard, that means the CPU clock : DDR2 Memory clock
ratio is set to 1:2. This gives a CPU speed of 2.7 GHz. I picked this
overclock because the system is stable with the CPU core voltage set BELOW
specification, and getting a few more hundred MHz isn't worth the added
strain. You have a different motherboard, so additional BIOS settings I use
likely will be of little use to you (for one thing, the EVGA 680i
motherboard has ~ 50 different overclocking parameters that can be set in
Not to put too fine a point on it, but you are just going to have to get in
there and dig. And perhaps spend days trying different settings in the BIOS
and different jumper settings (if appropriate for your motherboard.) That's
how you learn. That's how all of us learned to overclock. It may take you
a month or more to get a satisfactory overclock. Think of it as part of the
fun of overclocking (it actually is.) As long as you don't increase the CPU
core voltage more than 15%,nothing you can do will destroy your CPU or
system as you attempt to overclock.
By the way, try to use SOME sort of signature on your posts.
<stev...@email.com> wrote in message
The look of that BIOS seems familiar. Some tips for starters, in order of
A. NEVER use Auto or Sync mode for overclocking. Select Async and increase
the CPU speed from there.
B. In the memory settings, set the memory speed manually to 266MHz
(DDR2-533) rather than using AUTO.
C. Set all the memory timings like tRAS and whatever they're all called to
Disable spread spectrum.
and - config DRAM timing by SPD - try it both ways and see what's best.
and - set all voltages to AUTO.
You should get to 266MHz with these settings, which would give your E4400
Finally, If all else fails:
Enable the flexibility option AND set the memory speed in 'B' above to AUTO.
It relaxes memory timings and generally allows you to use any type of
memory, at great cost to memory bandwidth.
Let us know how things go. If it still doesn't go to that speed, you could
consider the BSEL mod that we can tell you about. And if it STILL won't
work, there is another mod to increase the default voltage that your
motherboard supplies to your CPU (works with all motherboards), but report
Lastly, could you download 'CPU-Z' and let us know what 'core voltage'
shows - this could tell us if the motherboard is to blame.