System crashes for no reason..

Well i just upgraded to an 8rga+ and did a clean format. I was running 166x10 for 30~ hours folding@home with some minior use on the computer without a prob. Then all of a sudden it crashed. I lowered the fsb to 133x10 and it did it again.. temps are fine. I cleared the cmos and am running all defaults so i'm not really sure what it is. No BSOD just a reboot with no overclock in it. Any help be great ty.

8RGA+
1600+ now @ 133x10.5
Samsung PC2700 256
Radeon 9500
Watercooled

i was thinking of a PSU issue my +12v is 11.73 and it was 12.5 with my old 8k3a+. +5v went up tho +5.11

EDIT::::!!!
i think this is the reason. How unsafe is it having my computer on with voltages like this and whats the change of the psu just blowing on me....

ohh i don't think this is good...

-12v = -7.09

+3.3 = 2.59

Don't sound good at all! Funny it's still running.

ya really