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i7 920 4ghz not stable - Page 2

post #11 of 27
I would benture a guess that it is a sign, yes. Any crashing, IMO, is instability. Granted... it might not be your cpus fault. I wanted to thank masterfire for that list, though, definitely useful.
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post #12 of 27
Thread Starter 
If that counted as a crash, I'm not sure what I should change in my BIOS. WIthout a BSOD theres no indication of what Im lacking =\\.
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post #13 of 27
Thread Starter 
Prime95 crashed after 1hr30min. No BSOD though.. following the guide I think this means up vcore?
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post #14 of 27
Safe bet, I'd assume. Worth a try.
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post #15 of 27
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I really wish there was a program that got results faster. I think I'll up vcore to 1.3125 and test it when I sleep. At 1.3 my temps get to a max of 76 on LinX. I don't think i'm gonna go over 1.31-1.32. If I can't get a stable OC by then, I'll just stick at 3.8ghz. I really envy those who get 4ghz under 1.28vcore.
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post #16 of 27
My 930 get 1.2875 volts for 4 ghz or 4.2ghz @ 1.3875volts. as long as chip is under 90 deg your good I like under 70 degs that's why i got @ 4ghz now.
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post #17 of 27
Thread Starter 
I'm just shocked that there is such a big jump from 3.8ghz Vcore to 4.0ghz. Considering at 3.8 I only needed 1.24v, I don't understand why at 4.0ghz I need over 1.3vcore. Of course, I guess all chips have their own tastes for electricity =P
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post #18 of 27
Thread Starter 
Other than vcore / QPI, what other factors play into CPU instability? For example, there are many settings in CPU configuration such as Speedstep / Turbo mode / C1E / EIST. Can these things also contribute to instability? I find that my test lasted the longest while on 1.296vcore and 1.3qpi. There were no BSODS or freezes, should I be looking into other suspects first before just increasing voltage?
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post #19 of 27
For 3.9Ghz I can run it at 1.25v with HT on. For 4.1Ghz I need ~1.32v with HT on. It is a pretty big difference in terms of voltage. On 4.2Ghz I need somewhere around 1.345v

Quote:
Originally Posted by Rakhasa View Post
I really wish there was a program that got results faster. I think I'll up vcore to 1.3125 and test it when I sleep. At 1.3 my temps get to a max of 76 on LinX. I don't think i'm gonna go over 1.31-1.32. If I can't get a stable OC by then, I'll just stick at 3.8ghz. I really envy those who get 4ghz under 1.28vcore.
50 runs of LinX on all RAM generally does just the trick for me. Not exactly sure how long that took me but I would say under 4 hours is a good estimate. But my PC is on 24/7, so if it's unstable I'll notice it sooner or later anyway. It could very well do 50 passes of LinX, to wake up to a frozen computer a week later or so.

Quote:
Originally Posted by Rakhasa View Post
Other than vcore / QPI, what other factors play into CPU instability? For example, there are many settings in CPU configuration such as Speedstep / Turbo mode / C1E / EIST. Can these things also contribute to instability? I find that my test lasted the longest while on 1.296vcore and 1.3qpi. There were no BSODS or freezes, should I be looking into other suspects first before just increasing voltage?
For me it always was like this: I would stress test an overclock, it would be unstable. I would up the QPI voltage, wouldn't make a difference. I would lower it to less than what I started with, would make a slight difference, lasted a bit longer, but still was unstable. Then I would turn the vCore up until it would be stable. My chip performs best under a 1.88v PPL btw. Some chips don't need over 1.8v and some take 1.9v, maybe that's also something to look at.

The list I posted is simply one I had found a few days earlier, I never actually went by it myself personally. Trial and error worked pretty well for me.
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post #20 of 27
Thread Starter 
Thanks for the reply, I was gonna give up 4.0ghz because im not very comfortable with anything over 1.3vcore. Does upping PLL allow me to lower vcore?
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