Possible PSU prob

[Obtuse]

I am having a strange problem, I believe it is PSU related, but perhaps not. When I first cold boot my comp (after say 12+ hours of it being off), after about 20 minutes of activity (usually gaming, but not always), the screen briefly freezes, then the computer completely powers down. After it has powered down, hitting the power switch will not turn it back on. I have to toggle my PSU's on/off switch 1 time, and then hit the power button on the PC, after which it starts up fine, and runs stable until I turn it off (I've left it on for days). This is a puzzling problem. Note: I have temp monitoring programs in place, no component is exceeding temps (proc stays under 50 C, vid card stays under 60 C).

Specs:

Intel core 2 quad q6600 (oc'd to 3.0ghz on 333 FSB)
4 gig Ballistix DDR2 800 (4 x 1gb).
MSI P6N platinum Mobo
BFG Tech BFGR88640GTSOC2E GeForce 8800GTS 640MB
WD 74 gig raptor
WD 250 gig sata
samsung sata dvd burner
Arctic Cooling Freezer 7 pro cpu cooler
PC Power and Colling silencer 750 pro
Coolermaster Cosmos Case

 

[o1die]

Even though you have a good ps, I would try a different one first. Any ps can fail. If a different ps gives you the same problem, then I would continue by testing the memory using memtest, a free download. You can also test the raptor using western digitals "data lifeguard diagnostic for windows", a free download.

 

[Zorg]

It could be the PSU but I doubt it. That Freezer 7 Pro uses the same crappy mounting pins as the Stock HS. I would run Rivatuner and log your temps, you will need the CPU temp plugin. Also make sure the temp warning is turned on in the BIOS. It may not be overheating but it's worth a look. Maybe run Prime95 25.5 while monitoring temps. Also you could download UBCD and test your memory.

Edit: I totally missed the fact that you were already logging temps, Duh. If that was a P35 I wouldn't think that you had any problem with your OC, But I don't know about the 650i chipset. I would default as per MrsBytch and test it. If it is stable then look to systemlord for the voltage tweaks. If you want to be lazy get a P35 and "set it...and forget it". Yes it will roast a whole chicken as well. :lol:

 

[systemlord]

"Your overclock has become unstable," How have you made sure that your OC is 24 hours stable? Whenever you OC a PC and the OC fails one of the things you have to do is remove the Cmos battery and or turn off you PSU switch on the back of your PSU for a few seconds. The fact that you don't have to reset your Cmos indicates that your OC failure is just in need of some small adjustment in bios. Been here done that.

What is you Vcore setting in bios? If its not enough then your CPU is starving for more volts under heavy gaming or usage. But when surfing the internet is not that stressful so it won't become unstable until you were to start stressing it out. If you could provide more info on your bios settings I/we can help you better.

What is your:
Vcore set to: Auto or a setting you set yourself?
Memory votage is set to: Auto or a setting you set yourself?
NorthBridge set to:?
FSB termination voltage set to:?