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Core i7 920 D0 - Need help with stable overclock

Infernum

Infernum

Infernum

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Joined
17 Mar 2009
Posts
491
Location
Yorkshire, England
Hi, bought an i7 CPU with intentions to overclock it to 4.2ghz. I have a Noctua NHU-12P Se1366.

Asus P6t Deluxe
Patriot Viper 6gb DDR3 1600mhz (8,8,8,24)
Core i7 920 D0

I try to OC the CPU to 4.2ghz but I always fail the stability tests in Prime95/Linx because my PC blue screens. Here are my Bios settings:

CPU volt: 1.31250
QPI/DRAM: 1.36250
CPU PLL: Auto
DRAM: 1.64

My timings are at 8,8,8,24 at 1600mhz

All other settings are on Auto.

Does anyone know why my PC blue screens in the stability tests? Is there an option in the bios other than the voltages that I am supposed to change?

Any help appreciated!!! The whole reason I bought this CPU was to have 4.2ghz :)

Also my bclk is 200 with a 21x multiplyer.

EDIT: I upped the voltages on cpu and qpi a notch or two and I ran prime95 small fft, but after an hour I got a blue screen :( Also my temps during the test maxed out between 83-87c is this acceptable?
 
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4.2Ghz is quite ambitious. You can't just expect that to work even with a D0. With a D0 you can "expect" 4Ghz. Anything else is bonus points.
 
I wouldn't feel comfortable at running on load with those temps. I cringe at 68 degrees lol.

I think the i7 starts thermal throttling at 100 degrees so be careful.

There are also a million other factors that could be causing issues such as uncore clock, QPI multiplier etc.

You could try with different cpu multiplier + clock combos too?
 
When I first used my 920 i7 D0 I was getting temps of 100C at load...I actually lapped the CPU a bit and the temps at load dropped to 90C but even that is too high in my eyes...so I am going to lap it more tonight and see what I get with it...I can hit 4.0GHz with no problem and it is stable but just the temps are not to my liking...at idle they are about 45C+ which isnt too bad but I want them lower...so I would also look into the CPU itself and make sure the surface is flat...other its the contact between the CPU and cooler that could also be causing high temps...
 
dmarcisz said:
The thing is, I have no idea which voltages to up. Like do I up to CPU or the qpi or both?
Click to expand...

Up your CPU voltage to about 1.3v. I had problems with mine being below 1.3v and it set the CPU to 4.2GHz when I wanted it to be 4.0GHz in the OS...however...and cos of it being 4.2GHz the system was unstable and kept getting BSOD. So I upped the voltage to 1.3v and so far so good. :D but then I think its down to the fact that I am using the P6T SE which may have certain limitations for overclocking...I am due to get my Deluxe V2 back next week...so I may be inclined to try that instead and see where I go with it...
 
killari said:
I wouldn't feel comfortable at running on load with those temps. I cringe at 68 degrees lol.

I think the i7 starts thermal throttling at 100 degrees so be careful.

There are also a million other factors that could be causing issues such as uncore clock, QPI multiplier etc.

You could try with different cpu multiplier + clock combos too?
Click to expand...

90c ;)
 
CK61938 said:
Up your CPU voltage to about 1.3v. I had problems with mine being below 1.3v and it set the CPU to 4.2GHz when I wanted it to be 4.0GHz in the OS...however...and cos of it being 4.2GHz the system was unstable and kept getting BSOD. So I upped the voltage to 1.3v and so far so good. :D but then I think its down to the fact that I am using the P6T SE which may have certain limitations for overclocking...I am due to get my Deluxe V2 back next week...so I may be inclined to try that instead and see where I go with it...
Click to expand...

The V2 is an inferior board to the V1 just in case you didn't realise. The only difference between the V1 is the removal of the 2 SATA\SAS ports.
 
dmarcisz said:
Hi, bought an i7 CPU with intentions to overclock it to 4.2ghz. I have a Noctua NHU-12P Se1366.

Asus P6t Deluxe
Patriot Viper 6gb DDR3 1600mhz (8,8,8,24)
Core i7 920 D0

I try to OC the CPU to 4.2ghz but I always fail the stability tests in Prime95/Linx because my PC blue screens. Here are my Bios settings:

CPU volt: 1.31250
QPI/DRAM: 1.36250
CPU PLL: Auto
DRAM: 1.64

My timings are at 8,8,8,24 at 1600mhz

All other settings are on Auto.

Does anyone know why my PC blue screens in the stability tests? Is there an option in the bios other than the voltages that I am supposed to change?

Any help appreciated!!! The whole reason I bought this CPU was to have 4.2ghz :)

Also my bclk is 200 with a 21x multiplyer.

EDIT: I upped the voltages on cpu and qpi a notch or two and I ran prime95 small fft, but after an hour I got a blue screen :( Also my temps during the test maxed out between 83-87c is this acceptable?
Click to expand...

I wouldn't go over 85c personally. Because you never know when it's going to be a hot day and it could push it to 90c which is a bad idea. Throttling occurs making your overclock pointless.

I'm in a similar situation, except I'm only using 1.28v and that's hitting 85c....Not sure what I want to do at this point.
 
hernaldo said:
The V2 is an inferior board to the V1 just in case you didn't realise. The only difference between the V1 is the removal of the 2 SATA\SAS ports.
Click to expand...

I know that now lol. I sent the board back cos it wouldnt recognise 6GB RAM only 2GB or 4GB. It was tested and they found no fault but they did say one of the pins on the CPU socket was bent. They re-aligned it and they are sending it back to me.

I bought the P6T SE though and that works fine so far...and I think its the board that's restricting me from going over 4.0GHz without having BSODs...I dont know if I am going to use the V2 when I get it back...but I might keep it and build another Core i7 system around it...just cos I can lol :D
 
I think I will look into water cooling, will makes a post in the overclocking/cooling section so hopefully someone can help me with the parts :)
 
I was in the same boat as you.
4GHz stable. 4.2Ghz failing small fft's.
I tried 200 BCLK with turbo on and 210 BCLK no turbo boost.
No joy.

I persisted to see if i could find the right bios setting to change and it turned out to be the uncore multiplyer.

It was set on auto which is x18, dropping it down to 17x enabled stable 4.2Ghz operation.

Give it a go might work for you as well.

edit:
Temps as reported by Coretemp are scary high.
I do not believe these to be correct however.
If the temps are to be believed the base of the heatsink would be too hot to touch but it is much cooler than my overclocked q6600's.
 
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Looks like temps are holding you back. Would be nice if you could post all your bios settings and also a pic of your case / cooling setup. There might be something obvious that we can help you with.
 
but it reads as a Ultra 120 Extreme...lol...I have found another site which sells it cheaper and lists it as the TRUE lol...so I will probs get it from there but cheers guys :D
 
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