I7 920 D0 not stable at 4.2GHz

phat_cow · Apr 21, 2010

Hi,

I've been trying to get this cpu to be stable at 4.2GHz. My computer specs:
G.SKILL F3-12800CL9T-6GBNQ 6GB DDR3
Noctua NH-D14
Intel Core i7 920 D0 Stepping
Gigabyte X58A-UD3R

anything I should do to make this stable? CPUZ says my Vcore is 1.312V and my temp never goes over 75 degrees when doing prime95 tests but it always crashes (BSOD) after an hour or so.

My BIOS settings:

nzaneb · Apr 21, 2010

Are you running Prime Blend or Small fft's?

phat_cow · Apr 21, 2010

nzaneb said:
Are you running Prime Blend or Small fft's?

Prime Blend. I almost hit 2 hours of stressing the CPU before I got the BSOD.

MIAHALLEN · Apr 21, 2010

Hey man

to OCForums

Might just need more CPU voltage. And there's no need to use "Dynamic Vcore" with your current settings (although it shouldn't hurt. Just use the regular Vcore option for clarity's sake

Try 1.35V and see how it does

BTW - 1 hour Prime stable is pretty darn good. :thup:

nzaneb · Apr 21, 2010

phat_cow said:
Prime Blend. I almost hit 2 hours of stressing the CPU before I got the BSOD.

Switch to Small fft's, if it still BSOD's, add another notch on the VCore.
If not, it's probably Ram related.
I always advise to set Ram timings, speed, and voltage manually. It's easier to work with.

phat_cow · Apr 21, 2010

MIAHALLEN said:
Hey man to OCForums

Might just need more CPU voltage. And there's no need to use "Dynamic Vcore" with your current settings (although it shouldn't hurt. Just use the regular Vcore option for clarity's sake Try 1.35V and see how it does

BTW - 1 hour Prime stable is pretty darn good.

Thanks!

Is it normal for a D0 I7 to require that much voltage to get to 4.2? I've seen people do it with 1.312

I'll try upping the vcore. I don't like the temperature though

MIAHALLEN · Apr 21, 2010

HAHA...one of mine needs 1.45V to get 4.2GHz....the other only needs 1.28V...they're all a bit different

Your temperature is very good...90s is high (I hit 95 when running Prime on my main rig....the one that needs 1.45V)

Seanie's Show · Apr 21, 2010

Just so you know, small fft's test CPU ie 8k, 16k etc, Large test RAM ie 4096, 3096 etc so its most likley your CPU failing, but and this is a big BUT, i too have this board and one thing I have found out about this board, is it hates too much voltage just as much as it hates not enough.

Is your RAM voltage right at 1.6v ?.

Have you manually set your RAM timings (Quick) 9-9-9-24-2T ?

Your QPI VTT voltage seems a little high, this voltage basically links your CPU to the x58 chipset, and for 200blk you really shouldnt need that much

Have a look at my settings here and copy if you like see where it gets you, just remember, every CPU is different especially where vCore voltage is concerened:

http://www.overclockers.com/forums/showthread.php?p=6459804&posted=1#post6459804

phat_cow · Apr 21, 2010

Is it normal that CPU-z reports a different vcore then the one I selected in the BIOS? I selected 1.5v but CPU-z reports the vcore as 1.312

phat_cow · Apr 22, 2010

I wonder if there's something wrong with my mobo because in the BIOS i set the vcore to 1.2625v and LLC to standard, but Easy Tune 6 and HWMonitor says my vcore is 1.232v. Thats a difference of 0.0305. I wonder if thats causing my OC problems?

nzaneb · Apr 22, 2010

What are your choices for LLC in the BIOS (standard and ???) I'm guessing that standard will be to Intel Specs, so it will VDrop when in windows.

mattspalace · Apr 22, 2010

phat_cow said:
I wonder if there's something wrong with my mobo because in the BIOS i set the vcore to 1.2625v and LLC to standard, but Easy Tune 6 and HWMonitor says my vcore is 1.232v. Thats a difference of 0.0305. I wonder if thats causing my OC problems?

That's vDroop and most motherboards have it to varying degrees. You should apply whatever the highest setting is for loadline calibration. Most just have 'enabled' or 'disabled', but I see the Gigabyte board has levels of LLC.

1.8v CPU PLL should be fine and I think your QPI voltage could be a bit lower, like 1.3v

nzaneb · Apr 22, 2010

VDrop = the difference between the set VCore in the BIOS and the actual VCore when you enter the OS

VDroop = the drop in voltage that occurs, when you fully load the CPU

VDrop you can account for, once you know what the difference is, by adjusting your BIOS voltages accordingly. VDroop can be controlled by Load Line Calibration. Be prepared for your voltages to be higher than what you set in the BIOS if you enable LLC.

mattspalace · Apr 22, 2010

Yes, correct. I figured it was under load, is it not?

nzaneb · Apr 22, 2010

mattspalace said:
Yes, correct. I figured it was under load, is it not?

Not sure

He doesn't say. You could be right. :-/

Oh well, both descriptions are out there anyway

mattspalace · Apr 22, 2010

Yeah true.. I just noticed a serious drop in vcore and figured it was 'droop', but then saw what you saw and though it was probably 'drop'.

Need some additional details, we do.

phat_cow · Apr 22, 2010

Makes sence now.

I have LLC set to Standard.I'm gonna change it back to Level 1 when I get off work.

I7 920 D0 not stable at 4.2GHz

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