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Hep diagnosing an intermitent, potential PSU problem

C

CestusGW

n00b
Joined
Sep 20, 2004
Messages
57
The rig:

AM2 X2 3800 (stock clocks)
Asus M2N32-SLI Deluxe
XFX 7900GT (stock clocks)
2x512Mb DDR-2 667 (4-4-4-12)
LG DVD-RW drive
250Gb SATA HDD
Floppy Drive
Coolermaster Praetorian Case (4x80mm fans)
550W Modular PSU (Ultra X-2)

The problem:

Over the past few weeks, I've been having application crashes, and sometimes full hangups with increasing frequency (from once every few days to once or more per day). I pulled my system apart, checked all the connections, cleaned all the dust off everything (there wasn't much) and then things seemed to be going alright.

The crisis:

Then I had a system reboot and an error pop up in BIOS: The 12V source on my PSU was only providing 9.4V. I powered the system off, unplugged the DVD-RW drive and the floppy drive and all the fans, left the side panel off and powered the system back on. BIOS then showed 11.94V. Power off, add the DVD-RW drive back to the PSU, check again: 11.90V. Power off, add the case fans back to the PSU, check again: 11.90V. Finally, power off, add the floppy drive back to the PSU, check again: 11.84V. Ran a pass of memtest86 like this, no problems.

Next step:

Here's where I'm stuck. I've been reluctant to keep pushing my system (posting this from my laptop), but I'm not sure how to track down the problem from here. The way I see things, the problem could be:
A) PSU is flaking out, but not doing it consistently
B) Floppy drive, DVD-RW drive, fans are shorting, but not doing it consistently
C) Motherboard isn't reading voltage correctly, but not doing it consistently

How can I go about isolating the component in my system that's responsible for this?
 
the bios is wrong. If it was at 9v, your computer wouldn't even work.

I'm guessing your issue has to do with memory. Memtest86+ it, maybe set it to 2T command rate, up the voltage a bit.
 
I ran memtest86 two nights back for ~8 hours, no problems there (it was the first place I looked). So the problem doesn't lie there. I guess the next step I'll take is to run some SuperPI and 3DMark stress tests to see if anything wonky pops up doing that.
 
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