7900GTX causing random reboot?

[vr4lyfe]

I just built a new system thats having random reboot issues only when I game.

Its completely stable with a slight over clock to 3.1ghz (E6700). I was able to run Prime 95 for 2+ hours stable and computed Super Pi 1m in 16 seconds.

However, when I game (Counterstrike Source), it has random reboot issues. Sometimes instantly. Sometimes after a few minutes. Sometimes even after half an hour. It doesnt matter if its a firefight or just looking at a blank wall. It locks up / reboot randomly, but surely.

I am running a single 7900GTX (Dell OEM brand) on a Asus P5N-E SLi board.

Could it be a PSU issue?

BFG's website says "A minimum 400W system power supply (with 12V current rating of 26A or more)" for their 7900GTX. "Minimum 500W system power supply (with 12V rating of 34A)" for their SLi config.

My PSU the Raidmax RX-630A. Its output is +3.3V@30A, +5V@45A, +12V1@18A, +12V2@16A, -12V@1.0A, +5VSB@2.5A.

Could that be the problem?

I should probably mention I have 6 hard drives hooked in also, 2 for main OS raid, 4 for storage. But during my testing, it didn't seem to matter much when I unplugged the extra harddrives.

Any help is appreciated. I have spent way too much on this comp to just 'live' with these random reboots.

 

[pfunkman]

Dont sound like the PSU to me but have you tried reverting back to stock CPU speed? Stable in prime95 dont mean stable in everything else. It may be your DELL mobo dont automatically lock your PCI-e bus when overclocking so you may be OC'ing your PCI-e bus unintentionally when overclocking your CPU.

 

[vr4lyfe]

I am not using a Dell OEM motherboard. The 7900GTX video card is the Dell OEM card.