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IBT fail, Prime stable, SB 2500k

post #1 of 13
Thread Starter 
As the title implies, last night my system passed a 12 hour blend test (4.4ghz, 1.31vcore), then today went through 20 passes of IBT and on the 20th pass, reported unstable. I'm brand new to SB overclocking, but I was under the impression that P95 would usually report instabilities even if IBT didn't.

So I'm wondering if this is indicative of any particular, specific issue. Maybe P95 needs 24 hours to be (relatively) certain of stability? Or maybe I just need more juice. My goal is for an OC profile with relatively low voltage (< 1.34 ideally), but today I upped the vcore to I think 1.32 or maybe 1.33 and it still failed 20 passes of IBT (always on the 20th, at the very end of the test). But just to reiterate my question isn't about voltages, but if Prime passes and IBT fails, is that uncommon with Sandy Bridge and what if anything does it indicate?
post #2 of 13
Try Prime for 24 hours. Most people go with 24 hours of Prime as a good benchmark for stability, when using it. Personally, I go with a combination of 24 hours Prime and 48 hours Folding before I declare a rig as stable.
post #3 of 13
Just out of curiosity are you using ITB with the avx instruction set?

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post #4 of 13
I am among the minority of people that, as said above, consider anything less than 24 hours Prime Large and 8+ hours Blend to be not guaranteed of stability.
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post #5 of 13
Well, let's put it this way. It took 1.26v for my 2500k to be Prime95 stable for 24 hrs but took 1.32v to be IBT (20 passes w/new instruction set) and Folding stable...so take that as you please
post #6 of 13
Thread Starter 
Interesting... thanks for the info, guys. Good to know.
post #7 of 13
Thread Starter 
Quote:
Originally Posted by Coopa88 View Post
Just out of curiosity are you using ITB with the avx instruction set?

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I just downloaded the avx instruction set, which I guess means I hadn't been using it. So now do I just drop it in the LinData folder?
post #8 of 13
Out of curiosity, how large are you setting the iterations on IBT?
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by Evil Penguin View Post
Out of curiosity, how large are you setting the iterations on IBT?
Max
post #10 of 13
If IBT fails, 75% time you need Vcore.
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