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Can't overclock my Q6600 past 2.7Ghz

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June 7, 2008 4:28:28 AM

Motherboard: EVGA 750i SLI
RAM: OCz ddr 1066 4gb (2x2gb)

I've been trying to overclock my cpu but once i put it past 2.7Ghz it becomes unstable and crashes.
Any suggestions would be helpful!
June 7, 2008 4:50:50 AM

we're gonna need more info like what voltages ur using, cooling, temps, etc. we'll get it figured out.
June 7, 2008 5:24:58 AM

Running the cpu on auto for voltage which is 1.3v
Memory is at 1.9v

using a Rosewill RCX-Z4 120mm 2 Ball CPU Cooler. air cooling.
I know temp isn't the problem because its running at 39 - 41 degrees c.

I just updated the BIOS to the most recent version.

Pcie is at 100mhz.

no clue. the pc will start and freeze after 10-20 seconds if it is anything past 1199 mhz FSB.
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June 7, 2008 5:46:31 AM

make sure your multiplier is set to 9.
June 7, 2008 5:51:24 AM

yep it's set to 9x. I'm really dissapointed in this board. the bios update even said improves stability with kentsfield processors and there is no change whatsoever. i've tried pretty much every voltage between 1.3-1.4v and everything is the same. I'm really clueless now.
a b à CPUs
a b K Overclocking
June 7, 2008 5:59:06 AM

Try 2.0 or 2.1V on the memory.
June 7, 2008 6:39:10 AM

i've tried 2.1v with no results. i'll try 2.0v and see what happens.

my memory timings are at 5-5-5-15 should i don't know if i should change them or leave them for now.
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a b K Overclocking
June 7, 2008 6:43:41 AM

They should be fine, especially at 2.1V.
June 7, 2008 7:11:04 AM

fairly certain its your motherboard holding you back. take the cpu up to 1.4v to compensate for vdroop (1.5v is max according to intel) try 8x333, and bump voltages up on everything just a bit. Then keep stepping up the fsb til you get to 400 or crash.

June 7, 2008 7:12:33 AM

oh, and run your memory 1:1 for now til you get it to clock where you want it.
June 7, 2008 7:24:36 AM

okay i just set it to 8x333 like you said and now it won't even boot at all. Its totally ****. i can't even get to the bios. i have no clue how to fix it now. awesome.
a b à CPUs
a b K Overclocking
June 7, 2008 7:30:00 AM

The first thing you should learn about overclocking is what to do when it goes wrong. Easy fix. Get out your manual and look for the instructions for the CMOS clear/reset jumper and move it so that it is in the reset position. Leave it for around 10 seconds then move it back. The manual should tell you exactly what to do. Make sure you disconnect power too. It's pretty simple as long as nothing blocks access to the jumper cap like it does for me :(  Get used to doing it, this sort of thing happens alot when OCing.
June 7, 2008 7:55:32 AM

yeah luckily my board has an easy cmos reset. just a button. like you said easy fix. anyway yeah i doubt my board is going to let me get past 2.7 Ghz even though it advertises it as a great board for OC'ing. I don't know what else i can do i've tried everything it seems.
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a b K Overclocking
June 7, 2008 8:31:33 AM

Should still be able to do better than that even with a poor board. There's probably one BIOS setting causing you problems, that's how it often is.
June 7, 2008 10:45:20 AM

dragonpie said:
Motherboard: EVGA 750i SLI
RAM: OCz ddr 1066 4gb (2x2gb)

I've been trying to overclock my cpu but once i put it past 2.7Ghz it becomes unstable and crashes.
Any suggestions would be helpful!

What is your approach to OC ??
How you are getting 2.7
What is your FSB and Multy. ???
It's a bios setting issue
leave everything on AUTO and start pushing FSB Frequency
Could be Memory/FSB sync. problem
Memomory can work with different DRAM/FSB ratios
1:1, 6:5, 5:4, 4:3, 3:2, 8:5, 5:3, and 2:1
depends on your mobo and bios
1066 RAM can work with Q6600 at following DRAM/FSB ratios
2:1, 4:3, 8:5

push your FSB to 400 and set Mutyplier to 8, You'll get 3.2GHz (Leave FSB strap on auto)
and keep votages and other settings to AUTO
If failed set your ratio to 4:3 while keeping your voltages to autoand see
IF things work you can start reducing voltages if too high till you loose stability then go back to prvious stable value
You can also try FSB frequency 333 and Multy. 9 you'll get 3 GHz
In this case you can use Ratio 8:5


June 7, 2008 2:28:23 PM

It could be your bios version. I was trying for ages to get my q6600 over 3ghz but the max I could get was 2.8ghz no matter what I did (I have a striker extreme by the way). Then after alot of searching on the net, I found out that the best bios to use for overclocking on my mobo was 1303. So I changed to that from 1305 and now I've got over 3ghz easy.
For some reason though, when I go over 3.2ghz it looks like it doesnt load the graphics drivers in windows because it starts in a low resolution, but im working on it, I only got it over 3ghz yesterday :D 
June 7, 2008 4:15:55 PM

i have been using multiplier 9x and trying anything between FSB 300-333 with no stability. It's probably my RAM i'm guessing.

so i should downclock my RAM from 1066 to 667? if i were to use ratio 8:5. That's what i got out of that chart.
June 7, 2008 4:50:20 PM

i put the FSB at 400mhz and multiplier to 8x with no stability. It just freezes.
June 7, 2008 5:09:41 PM

try running your ram unlinked , it could also be your psu, i have the same mobo
and proc and can get to 3.6 on air just make sure you have a good psu
and keep all your voltages in the green area for that bios,setting to auto will put you in the red in most cases(for that bios)
June 7, 2008 5:49:37 PM

i've always run the ram unlinked.

I'm using a Rosewill RP600V2-S-SL 600W SLI Ready-ATX12V V2.01 PSU

what are your voltage settings??
June 7, 2008 8:05:53 PM

vcore at 1.4,the rest on auto but if in the red i just go to the highest green setting, also some fsb numbers hit dead areas on your mobo,like you might be able to get stable at 1425(3.2ghz) but not 1250(2.8ghz)
sometimes the mobo just wont let certain numbers work ive heard it called dead areas on the fsb
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a b K Overclocking
June 8, 2008 4:29:56 AM

That's related to the NB Strap and was particularly prevalent in P965. The NB chipset's internal timings are too tight to run at a certain FSB, but when you go over a certain speed it loosens up automatically and you can run stable again. For P965, you couldn't run much between 350-399FSB, but you could hit 420FSB pretty stable.
June 8, 2008 5:44:07 AM

I solved the problem. I had nTune installed. Apparantly this program isn't very compatible with vista 64 bit. My machine would boot every time but it would just freeze up after about 10-15 seconds... i would get the same result if i tried to OC directly from nTune which is why i didn't use it. However after i booted up it was still affecting the cpu apparantly and once i uninstalled it i overclocked to 3.0 ghz no problem. thanks for everyones input :) 
a b à CPUs
a b K Overclocking
June 8, 2008 6:10:11 AM

Why didn't you say you had nTune installed? I would have suggested you remove that before yuo do anything else :lol:  The devil's software I tell you!
June 8, 2008 6:19:57 AM

you need to increase every other voltage on that board slightly to make magic happen.auto isnt the best solution here.if its an INtel board you can do away with auto.not with Nvidia.and look out for the vdrop and vdroop.dont rely on Bios vcore value.CPU-Z!!!
June 8, 2008 12:13:34 PM

Affirmative

Set your NB voltage between 1.30 and 1.40
Set Vcore arround 1.30
Set SB arround 1.50 (or other settings(not familiar with EVGA))
Set HT to arround 1.30 (not familiar)
Then multiplier 9X
FSB 333 X 4 = 1333Mhz
Core speed = 3.0Ghz
June 8, 2008 12:22:09 PM

Ok, i see you are also using 750I SLI, normally they have the same Chipset, Northbridge and Southbridge
I got my Q6600 (VID 1.325) stable at 3.0Ghz

These settings should work for you

NB 1.30
SB 1.50
HT 1.30
Vcore 1.325 (or 1.30 if you have a lower VID)
MEM AUTO (or default voltage of your ram, every ram has another voltaege f.e. Kingston : 1.850, OCZ 2.1V, ....)

Rated FSB 1333Mhz
333 Mhz X 4
Unlinked
Ram 1066Mhz (Ratio 8:5)
Memory Timings Auto

I hope this settings work for your 750I motherboard
I am not familiar with EVGA, so don't kill me if the settings don't work :kaola: 


November 1, 2009 10:47:45 PM

hi i have the same problem my q6600 is in a nf650islit-a motherboard and the only way i can overclock is by the fsb and any thing over 2.7GHz and it jst becomes unstable and crashes
my multiplier is 9
core voltage is 1.27500v
!