Prime95: Small FFT vs Large FFT

[lopri]

I've tried to get my X2 to run at 2800MHz and of course did torture test using Prime95. It seems to pass Small FFT but fails Large FFT around 35mins mark. What'd be the culprit? Heat? Memory? HTT?

Edit:

 

[DrMrLordX]

I'd say memory. Tried memtest yet?

 

[SamzAthlon]

Originally posted by: lopri
It seems to pass Small FFT but fails Large FFT around 35mins mark.
Edit:

How many hours did it pass small fft?

 

[lopri]

Originally posted by: DrMrLordX
I'd say memory. Tried memtest yet?

That's what I've been thinking, too. Haven't tried mentest yet.

Originally posted by: SamzAthlon
How many hours did it pass small fft?

Over 8 hours. (Stopped it cause I'm impatient. )

 

[Ike0069]

Run the torture test. If it fails quickly but runs the small FTT fine, then it's almost guarenteed to be the RAM.

 

[orangat]

cpuburn is better suited for testing. It was designed to load as many execution units as possible instead of programs like prime95 which might only stress certain components of the cpu. The bundled burnmmx also stresses memory.