Guide to Overclocking the Core I7 920 to 4.0ghz - Page 2 - Overclock.net

fishman78 · 07-12-09

Nice Guide! Where was this when I was pulling my hair out 3 days ago trying to figure it out

+ Rep!!

chadamir · 07-12-09

Quote:

Originally Posted by Wadkiller

Can someone maybe confirm that the CPU & IOH clock skew on 100ps allows a lower vcore to be used with the same oc?

I'm currently running my D0 @ 3.8GHz with a vcore of 1.225, haven't really stress tested it, ran Prime small fft's for an hour & then jammed some COD. Will stress it properly tomorrow.

I dont see why it would but maybe I'll give it a shot later.

Also, I added a bit on a load line calibration (Sorry forgot this setting).

Thanks for all the positive feed back guys!

Wadkiller · 07-13-09

Chadamir, sorry for the noob quetions, but i think as you help me you can also expand the guide a little bit.

So far i've gathered that the IOH is the NB. So when i use higher bclk's do i need to increase the IOH for stability?

I've seen some people said they try to use the same QPI/dram volts as the vcore for increased stability, is this true?

EDIT: why do some people avoid using even cpu multipliers, for example 20?

EDIT, again: Im busy priming 3.8GHz & after about 2 hours i got a P95 "124" error, but my QPI dram was @ 1.375. I'm running 200*19. Should i increase the QPI/dram volts or what?

chadamir · 07-13-09

Quote:

Originally Posted by Wadkiller

Chadamir, sorry for the noob quetions, but i think as you help me you can also expand the guide a little bit.

So far i've gathered that the IOH is the NB. So when i use higher bclk's do i need to increase the IOH for stability?

I've seen some people said they try to use the same QPI/dram volts as the vcore for increased stability, is this true?

EDIT: why do some people avoid using even cpu multipliers, for example 20?

EDIT, again: Im busy priming 3.8GHz & after about 2 hours i got a P95 "124" error, but my QPI dram was @ 1.375. I'm running 200*19. Should i increase the QPI/dram volts or what?

You can get a 124 error if it's too high. Start over at 1.25 and see how much voltage you need would be advice. You can try using the same but again, that's why I advise starting at a certain point and working your way up or to just try values you're sure will work. How fast is your ram? There are technical reasons why the 20x doesn't work http://www.xtremesystems.org/forums/...&postcount=877

Wadkiller · 07-13-09

I've got 1600MHz 3*1GB dominators, i'm running @ their specced timings & volts.

cokelight · 07-13-09

great guide! But what if something like intel burn test or occt finds errors but doesn't give you a BSOD? What could possibly be wrong with that?

Beric · 07-13-09

Great guide! I'll use this today when I overclock my D0 for the first time.

timisyourfriend · 07-13-09

Real nice write up! If you can't overclock after that write up, just quit. haha

FtW 420 · 07-13-09

Quote:

Originally Posted by cokelight

great guide! But what if something like intel burn test or occt finds errors but doesn't give you a BSOD? What could possibly be wrong with that?

I'm curious about this myself, when testing an OC with prime95 sometimes just 1 of the 8 workers will fail & everything else just keeps chugging along till I stop it.
Anyone know if it's voltage, memory or ??? (what to adjust for stability at this point)?

chadamir · 07-13-09

If 1 of 8 workers fails, especially during small fft then it's cpu voltage. Bump it once or twice. As for the other tests, I don't know what their errors mean. Linpack/IBT/LINX all produce errors which are hard to determine. That's why I dont like them. If it fails during large fft then its probably memory error you can try running memtest/upping ioh. I would try running small fft at that point for a good amount of time and make sure its not the cpu voltage. If it passes 8-12 hours of small fft then work on making it pass large fft. Just remember to keep track of your settings.

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Guide to Overclocking the Core I7 920 to 4.0ghz

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