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Stress testing - when to use prime95 Large FFT, Blend or Small FTT?

post #1 of 10
Thread Starter 
Hi Everyone,

I'm stress testing right now my rig with the Quad Q6700 processor. Runs 24/7 at 3.33 GHz. Testing to see how low the vcore can go at this time. Bios vcore set to 1.30...vdroop about 1.278...

Seems like some of the OC tutorials mention to stress test with prime95 set to Large FFT. But when reading other posts some use Blend and others use Small FTT.

Anyway...could someone shed some light on when to use Large FFT, Blend or Small FTT.

Many thanks.

John
    
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post #2 of 10
i believe large is for mem, small is 99.9% cpu only and blend ofcourse is both.
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post #3 of 10
I've always used the blend test because it stresses both the cpu and ram and imo gives the most complete stress test. Others may have their preferences, but I've always used the blend test to test my overclock.
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post #4 of 10
I use OCCT's mix test (its equivalent of 'blend') for my stability testing, and I presume that is what is required to declare an OC "officially stable"?
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post #5 of 10
if you havent done anything to the memory then just do the small ffts but if you have oced both of them then do a blend test.
post #6 of 10
Thread Starter 
Thanks guys.

I've run Large FFT for all my stress testing. As far as memory settings go I've just upped the voltage to 2.06...so maybe I should do a blend test too?

Overclocking is new to me but I seem to have hit a wall at 3.4GHz with the Q6700. 3.33GHz was so easy. When I have more time I'd like to revisit 3.4GHz and beyond! That'll be a new thread.

Best,

John
    
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post #7 of 10
I'm in the same state (although I haven't put much effort in tbh) with my E6700. 3.33GHz came easy, just with a VCore bump. 3.4GHz wasn't stable at that VCore, and upping the other voltages didn't help either. I may tweak VCore in the future to try an get 3.33GHz stable, but I'm already hitting 56-57 under load, so I don't think it's worth pushing it.
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post #8 of 10
imxp blend is also useful to test whether you need more northbridge voltage at higher fsbs
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post #9 of 10
has anybody worked out the probable cause of a freeze in prime is ???
as I had a freeze running a 456 x 8 blend in prime looks like it froze on a small fft 8k session
    
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post #10 of 10
Quote:
Originally Posted by killbot View Post
has anybody worked out the probable cause of a freeze in prime is ???
as I had a freeze running a 456 x 8 blend in prime looks like it froze on a small fft 8k session
Freezing on small ffts indicates that the cpu needs more vcore. However at that fsb you may want to try raising the nb or fsb voltage if vcore doesn't help.
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