small or large ftt in prime for stability testing and how long?

4737Joker · 6 Feb 2013 at 23:37

Hi,

Im currently testing an overclock and wondered which is the best way to test cpu stability using prime, small or large ftt? And for how long should i test it?

To go a little off topic, i had my vcore set manually at 1.2 for a 4.5 oc, just set it to offset mode at + 0.050 and its currently running prime large ftt test at 1.14v which is a lot lower than the manual vcore i had it set on before. perhaps i had it too high but 1.14 seems quite low for a 4.5 oc or am i wrong?

edit: actually just noticed its 1.104v not 1.14 :S

edit: if prime crashes (just got a prime has stopped working message) is that a sign of instability or has it just randomly stopped working? the computer didn't crash/hang at all so im guesing it was just random. I'll resume testing now

4737Joker · 7 Feb 2013 at 00:15

temps are only hitting 55, reckon i should push more?

PCZ · 7 Feb 2013 at 00:49

Your core voltage is way too low.
Prime crashing is telling you that.

Ideally you should use both small and large fft's.

The small fft's test mainly the CPU and the cache.
The larger fft lengths test the memory as well as the CPU.

When you think you are stable then do a blend test and let it run through all the fft lengths.

joeyjojo · 7 Feb 2013 at 11:13

Failure => unstable.

I'd also strongly recommend 10-100 loops of Intel Burn Test at max memory (probably about 7 GB in your system). Faster and hotter!

4737Joker · 7 Feb 2013 at 12:21

should i increase the offset? or switch to manual

Just to note as well the pc has not bsod once at these settings, and prime ran for 30 minutes after i restarted it then i closed it and went to bed.