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Need clarification on Prime.

post #1 of 6
Thread Starter 
Hello.
So basically, small FFTs are for testing if the CPU itself is stable, Large FFT is for RAM (Which fails for me often if i go for 4.2GHz) and blend is testing both?

I cant really find any answers from searching the forum about the blend setting... So please, enlighten me.
Thanks.
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post #2 of 6
Quote:
Originally Posted by L36 View Post
Hello.
So basically, small FFTs are for testing if the CPU itself is stable, Large FFT is for RAM (Which fails for me often if i go for 4.2GHz) and blend is testing both?

I cant really find any answers from searching the forum about the blend setting... So please, enlighten me.
Thanks.
Thats correct, small fft's hardest stress for vpu alone and others like blend do just that they blend test cpu,ram etc
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post #3 of 6
I'd say small ftts for the cpu, memtest for the ram. Blend doesn't really stress it enough, other than that you can also test using linX and IBT.
post #4 of 6
Thread Starter 
Quote:
Originally Posted by Chewy View Post
Thats correct, small fft's hardest stress for vpu alone and others like blend do just that they blend test cpu,ram etc
Alright, il be doing small FFT for now to make sure my CPU is rock solid, when i get at least 6-12 hours of stability, il move on to large FFT.

Quote:
Originally Posted by 7ranslucen7 View Post
I'd say small ftts for the cpu, memtest for the ram. Blend doesn't really stress it enough, other than that you can also test using linX and IBT.
Funny, because il fail large FFT, but il pass memtest with like 4 passes wit the same settings ect.
Give me time, let me test the CPU properly first...
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post #5 of 6
Quote:
Originally Posted by L36 View Post
Funny, because il fail large FFT, but il pass memtest with like 4 passes wit the same settings ect.
Give me time, let me test the CPU properly first...
That's the problem I have too with my 2500k. I can pass Small FFTs and memtest86 endlessly, but once the FFTs reach a certain size, I'll get BSOD 124s in just a couple of minutes. I've tried every different RAM/VCCIO/PLL voltage combination, all different memory timings, all sorts of CPU offset & manual voltages with no luck.

I *can* pass the Large FFTs @ 4.8 GHz... but it requires a massive jump from 1.42 to 1.5 in CPU voltage! So that's just not worth it. My max temps are under 70C, even when my CPU is running well over 1.4v, so that's not the issue either.

I run 1.42v 24/7 and I am 100% stable in everything; work (Photoshop/Illustrator, 3ds Max, MSVC++), gaming, movies, you name it.. large FFTs in Prime95 are the only thing that brings this rig down. So I just don't do it anymore. Everything else works great, so after about 200 tests and dozens of hours I guess I lost the will to keep trying to solve the large FFT issue.
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post #6 of 6
i have found that just running large or small is pointless.
i've passed small for hours and then ran large for hours and passed
but only to fail running blend,theres something about the switching
between the FFT sizes that will bring errors to light.so now i only use blend

but here are the basics of Prime95 are like this.

errors in small fft's are most likely cpu related
errors in large fft's are memory and NB/IMC related
if vcore is way too low it can error in large or small or crash
small fft's are these 8k,14k,20k and so on
large fft's are these 768k.986k,1024k and so on
running blend switches between small and large,so depending
on what size it fails at will determine what needs to be done
to fix it.

heres a great link on how Prime95 works and how to use it.

Torture test your CPU with Prime95



hope this helps
Edited by radaja - 4/29/11 at 1:27pm
    
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