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CPU VTT, QPI and IOH voltage interactions with an i7 920 rig - Page 3

post #21 of 26
ohh..

did you have C1E EIST C3/C6/C7 enabled??HPET and other powersaving stuff ON??

you should get a nice 4.2ghz around 1.35v on core..it seems that your memory mutliplier is set to x8..you can freely set the timings on 9-9-9-24..set your uncore frequency to x16 and make adjustments to the ff:

CPU VTT: 1.35v
IOH core voltage: 1.20v
ICH I/O: 1.16v
QPI PLL or voltage(if you have): 1.16v
CPU PLL: 1.7v(sometimes lower voltages help instead of higher ones)
DRAM voltage: 1.66v

let us know if anything comes up..
Edited by kairi_zeroblade - 1/19/11 at 8:37pm
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post #22 of 26
Thread Starter 
I'm not trying to be rude, but I don't see how lowering every voltage is going to bring me closer to being stable. As xxbass suggested earlier, higher voltages, is unstable.

Also, within this thread every single voltage I have is listed, as well as pictures of all available choicee. While I understand you're trying to help, I feel like what i have posted is being ignored.

I'm certainly frustrated that many seem to be able to find stability much lower. I was hoping I had missed something.
 
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post #23 of 26
Quote:
Originally Posted by stu. View Post
I'm not trying to be rude, but I don't see how lowering every voltage is going to bring me closer to being stable. As xxbass suggested earlier, higher voltages, is unstable.

Also, within this thread every single voltage I have is listed, as well as pictures of all available choicee. While I understand you're trying to help, I feel like what i have posted is being ignored.

I'm certainly frustrated that many seem to be able to find stability much lower. I was hoping I had missed something.
well as it seems that I can be stable at the said setting and your's can't even try it..maybe your chip is holding you back..there's nothing wrong with the specs..it may just boil down with your chip loving those high settings..welli was just trying to help though
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post #24 of 26
It really is possible that lowering voltages might help with stability.



But I'm drunk because we should have a snow day tomorrow...





So I'll get back to you later
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post #25 of 26
stu, you said you have a D0 chip, right? I have spent a lot of time figuring out what "safe" is for QPI/Vtt (bus/DRAM) since my RAM demands it. The best info I have found so far is here, where you will find 13 pages of discussion about exactly what the margins are on QPI/Vtt on air, water, and phase... with lots of destructive evidence. The consensus is that "safe" can be quite high. There is also a lot of discussion about D0 chips being fussy about lower voltage. It is worth the read.

Not stealing the thunder from bassplayer, good help there. Thought I'd share this link for some foundation knowledge.
     
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post #26 of 26
Quote:
Originally Posted by saaya
Conclusion:
Its been 6 months since Intel launched i7 and there have been less than half a dozen reported dead cpus.
Considering all the torturing those chips go through with ln2 cooling and vcores in excess of 1.7v, vdimm in excess of 2.2v and vtt in excess of 1.7v, this is very good news.

1.6v vcore, 1.6v vtt and 2v vdimm
These seem to be 100% safe, as long as the processor is cooled well enough.
I think even higher voltages are fine but there hasnt been a lot of feedback of people using high voltages 24/7 so far.

For extreme cooling there seems to be almost no limit as to what voltage is ok, as long as the cpu still scales, its probably fine
That's the part I like. My i7 950 had seen VTT up to 1.755V on dice and is still going strong.

I've never gone over 1.9V VDimm... I might have to change that!
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