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Prime95 Failing on Blend but not on FFT's

post #1 of 11
Thread Starter 
I'm not sure what to make of it, prime95 runs for 12+ hours without a problem on small and large FFTs, but fails in blend test after only an hour. I ran Memtest for 24 hours and it was stable.

CPU Settings:
22x173.6 = 3.8GHz
Vcore 1.288V
IMC 1.25V
PLL 1.90V

RAM Settings:
1390MHz 9-9-9-24 @ 1.5V
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post #2 of 11
I believe Small and Large FFTs is used for testing the stability of your RAM overclock more than anything, and Blend is a mix of everything. Your RAM is most likely not the issue here since it's not failing in anything but Blend. It's probably your CPU overclock.
post #3 of 11
I had previously thought that blend is very ram and northbridge intensive.
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post #4 of 11
Small FFTs is purely CPU. Large FFTs tests some RAM. Blend tests everything and a LOT of RAM.

Therefore, it looks like your RAM is not stable.
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post #5 of 11
Blend is the most memory intensive of the tests.

Memory or IMC settings are likely to blame for your instability.
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post #6 of 11
reverse what E-Peen and you got you answer blend uses more ram. if its failing on that check your voltage to your ram, clock speed of your ram still issues. try loosening up your timing a bit and try that. Oh and what command rate are you at 1t or 2t. 1t is faster but 2t is more stable but slower
Edited by IrishV8 - 10/23/11 at 1:18pm
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post #7 of 11
Try raising IMC voltage 1.27 or 1.30v. The IMC on Lynnfield and Nehalem are not as good as Sandy Bridge.
post #8 of 11
Thread Starter 
The ram is rated for 1600mhz 9-9-9-24 @ 1.5V.

I have it set to 1390MHz 9-9-9-24 @ 1.5V command rate 1T. I don't think it's the RAM modules considering it passed memtest with flying colours and I have tested the RAM on blend previously with higher frequencies but with lower CPU speeds without a problem.

Someone suggested IMC voltage, I'm going to raise it and hope it's stable. Could QPI frequency also be causing an instability when running blend because I have it set pretty high at 6250MHz.

I'm currently running blend with IMC 1.25V, command rate 1T, but I lowered the QPI to 5550Mhz.
If it fails, I'll increase the IMC and use command rate 2 and see if it works.
Edited by OrangeBunnies - 10/23/11 at 1:29pm
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post #9 of 11
Quote:
Originally Posted by Blameless;15423050 
Blend is the most memory intensive of the tests.

Memory or IMC settings are likely to blame for your instability.

Ah, okay. Noted for the future smile.gif
post #10 of 11
Bit stuck on that one hmm. Best way it to test every solution and find the one that works and educate those in the same situation.
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