PSU Problems? Or MOBO is toast?

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SPECS:
Asus A7N8X
AMD xp3000+
1gb Corsair PC3200 XMS LL
ATI 9800 pro ? Geforce 7800 GS OC
Maxtor 120gb SATA
Antek TruePower 480
Audigy 2

Problem History:
Computer began restarting during active periods in windows over a week ago.
3dmark 03, 05, and 06 all freeze during load of or near start of tests
(tests sometimes render normally for 20 sec before freezing)
-Causes non-recoverable crash, no error reporting, PSU must flipped

-Windows was reformatted and the ATI 9800 was upgraded to an AGP Geforce 7800 GS OC.

- All drivers are up to date, bios up to date, mobo drivers up to date, raid as well
- windows is also fully updated

-Tried multiple driver versions for raid, and many graphics drivers
- Still getting random restarts every hour or so and 3dmark has same problem.

-Ram was checked using windows ram diag and mem86 (5 passes)
- errors found under two tests (10ish total)
-isolated sticks via removing one at a time
-one stick found to be the only one defective
-booted computer with the good piece of ram and tried 3dmark 03, and 05
-this failed as usual and my computer still restarts when in windows
- tried installing a game (F.E.A.R) to test but could not finish without restart

Conclusions:
-The ram sectors that are not matching are not the cause since the computer was booted with the single stick of good ram and problem persisted.
-PSU could be the problem? Rails under PC Probe look tight however…
-Motherboard?
-CPU?
-HD?

Any suggestions would be greatly appreciated!. Thanks for all of your help.
 
1. check ram with memtest 86+ for at least 7 passes.
2. PSU is most likely the culprit.
 
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