small fft cover all c2d cache?

[ziddey]

e6400 running at 8x450=3600
buffalo firestix 2x1gb d9gmh rated 800 5-5-5-15 2.1v
running at 1:1 450 5-5-5-15 2.3v

passes memtest 24hrs. tested test5 3 hours.

passes orthos small fft for 27 hours at 1.44v actual load voltage

however, system is more or less unstable. 3dmark will eventually bsod. programs randomly terminate.

large fft crashes after 2 hours.

If I pull vcore up to 1.455 min under load, it'll pass large fft for 14 hours. I was thinking of stopping the test, but when I opened rivatuner, it crashed. programs still randomly terminate.

System works completely stable at 8x400=3200 with 1.3v load volts. Ram at 1:1 400 4-4-4-12 2.3v.

psu is a shitty ultra vpower 500w, but it does work completely stable at 3.2... 3.6 looks so close to being stable.

I once ran blend at 3.6, using 1.59v set volts (around 1.52v under load), and it passed 24 hours. However, system is still otherwise unstable, with random terminations and crashes.

psu blows extremely hot exhaust and a hint of burning. Think a better psu will get me stability at 3.6? Or is cpu just not willing to be stable at 3.6?

I've had two e6400's, one l630a and one l617a (f5 b1 engineering sample). Both are pretty similar behaving.

Load coretemp gets to 60'c peak at 1.455v with apogee block.

edit: so as title asks, is small fft enough to cover cpu stability? It runs forever stably...

 

[Arcygenical]

Large FFT stresses RAM more than CPU...

Might be the source of your instability (especially if things are crashing)

 

[theelectic]

The only Ultra PSU worth it to use in a computer is the X-Finity series, as you say all the others are junk. If other E6400s are failing similarly with the same PSU, you know your cause.

 

[Arcygenical]

The only Ultra PSU worth it to use in a computer is the X-Finity series, as you say all the others are junk. If other E6400s are failing similarly with the same PSU, you know your cause.

I used an X-connect (rev1) for a long time without any issues. I even ran my GTS off of it.

Their Ultra X VS series PSU's are pretty nice too.

 

[ziddey]

hmm, I understand that large stresses ram. And I did run into problems with my d9's degrading over a month or so (max voltage was really only around 2.3v...), but where they are now, I'm able to run memtest for 24+ hours without hiccup. Yet large fft will eventually still bomb.

I just did for the fun of it, 8x400 with lower voltage and it primed large fft 24+ hours just fine and everything is behaving fine. Guess I'll look into another psu again. Such a pain in the ass since I'll have to remove the radiator to get to the psu and might have to remove the motherboard too. Maybe I'll take my old ttgi and try powering fans, pump, and hard drive off it to relieve some load and see what happens.