E8400 4Ghz OC Orthos 'Gromacs core' stable but not 'Small FFTs' - Looking for input

Anubis386

Anubis386

Anubis386

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Joined
28 Jan 2007
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Location
Oxfordshire
First of all .. Specs:
E8400
Asus Maximus Formula (BIOS 0907)
Transcend 2GB DDR2-1200 Kit
Corsair HX520W PSU
7300GT (Being upgraded very very soon)

I've got my E8400 overclocked up to 4050Mhz (450x9) with 1.39v and its running 9hour+ Orthos 'Stress CPU with Gromacs core' stable, thats 9hours of running Orthos while surfing the net, running a few other programs (mostly photoshop, msn) and watching 720p videos .. So pretty dam stable if you ask me ..

However, when I go to run Orthos 'Small FFTs' the test gets errors within minutes .. I've tried:
  • Bringing CPU voltage up to 1.44v
  • Increasing CPU PLL voltage
  • Increasing NB voltage
  • Increasing FSB Termination (CPU VTT) voltage
  • Changing the CPU GTL Reference (down to .59x, lower results in blue screen)
  • Changing the NB GTL Reference (down to .60x)
Increasing CPU voltage, CPU PLL and FSB Termination seems to increase the amount of time Orthos Small FFTs runs before getting errors, 1.44v got to around 2hours. Increasing the NB voltage just bought NB temps up and changing the GTL references seemed to do nothing.

I'm basically looking for any input, I don't really want to bring the CPU voltage up any higher then 1.45v and the voltages I went up to on everything else was as far as I was comfortable without any better cooling. CPU temps remained well within safe (and very comfortable) levels under my U-120Ex as did board/NB/SB temps (8 case fans helps) ..

So any ideas of what I can try to get Small FFTs stable? or should I just give up seeing as its already dam stable? ..

Cheers
 
May be at limit, I would not run Gromacs for 9 hours, waste of your time.

I run say 20mins of each and then leave on blend overnight.

Blend I believe does a Mix of them all, not 100% sure though.
 
Yeh Blend is a mixed test, a bit of RAM with CPU .. I get the same errors with that test tho as I do with Small FFTs .. Even if the Gromacs test is a waste of time tho surely 9hours+ of it keeping the CPU at 100% while running other things is a good stress test .. I'm just wondering what else I could do to get my CPU to pass Small FFTs and other tests ..

Cheers
 
Anubis386
I think you already know the answer.
If you wan't to do long small fft runs you have to increase the vcore,

But should you bother, probably not as you have said the computer is stable running your apps.

If however you were to use that computer for number crunching then it would fail regularly and be useless for the task.
Unless of course you reduced the overclock to a point were small fft's didn't fail.
 
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