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No matter what I do, my OC fails, why? - Page 5

post #41 of 48
Rounding error again?

Still using ~2.6GHz uncore? If so, try reducing QPI voltage instead of increasing it. With a BCLK of 160 and that low of an uncore you shouldn't really need more than 1.2v or so.

Could also be memory.
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post #42 of 48
Thread Starter 
You mean that the memory could be broken?

I've decreased the uncore a notch, raised the vcore by +0.010v.

And yes, it's rounding errors.

Can i determen with memtest if it is RAM och something else?

I'm gonna let it run over night now, if i get more errors I'll lower the QPI.

Edit
Put up that uncore to ~2.6GHz and QPI down to 1.2v and pushed the vcore up to ~1.288v. I really wanted to be able to go a 24 hours prime, but I might have to settle with 8 hours.
Edited by frW - 1/11/11 at 11:11pm
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post #43 of 48
Thread Starter 
Allright, Prime95 ran nicely with small fft for 14 hours but then I started running IBT and it gave me errors after ~10 minutes... why oh why?

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post #44 of 48
Small FFT barely touches the L3 cache and memory controler. IBT uses much more memory and will hit the L3 + IMC + RAM much harder. It's likely either memory timings (try increasing rount trip latency, if possible), QPI/VTT, or uncore speed.
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post #45 of 48
Thread Starter 
I figured the RAM kit was bad, so I changed it and now it runs smoother. I downclocked everything back to stock and tried testing the RAM and it failed. So I RMA:ed it.

Anyways now I am back to the OC:ing, trying 4200MHz @ 1.344v temps are peeking at ~78 celcius with IBT though, dunno if that is too high. Using 168x25.
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post #46 of 48
78C in IBT is acceptable at that voltage.
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post #47 of 48
Thread Starter 
Looks pretty promising. Dunno if I can push that BCKL a little bit further and still stay at the same vcore / temp.

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post #48 of 48
Thread Starter 
This is weird, I get good results after 50 runs of IBT, memtest 4 for windows runs fine ( 200% coverage ) with 12 * 900MB.

But when I run prime95 for 8 hours with FTT time on 5 minutes instead of 15, I get errors after 8 hours, why?

Can I consider it stable enough?
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