My system

Well, I did what you probably have already done, and looked around for benchmarks using a 4650 and showing some type of power usage. What few I found seem to say it uses very little power, even at max load.

Assuming that's correct, 380W should have been enough.

If it is indeed the psu . . . I can't tell you exactly how much you are drawing, yes you can just buy a quality 500W psu, and its unlikely anything other than perhaps some disk files has been affected.

Best would be if you could borrow a higher wattage, or any known good psu and see if it solves the problem.

As an aside, how are your temperatures before the crash? That might tell us something else is a problem.

thanks for the replies

@ twoboxer - im unsure of the temperatures before crashing, ill find out. All i know is though, that its starts off playing ok, and then slowly things start displaying incorrectly, players start becoming transparent, black boxes appear for things and then it just resets.

Upon immediately exiting cod 4, smartdoctor is telling me its around 50 but that could be several degrees shy of what its running at. I think smartdoctor has an alarm that goes off at 80 degrees, so im not sure it the temperatures are going passed that.

@gkay09 - i think your right, i put some rough things into the caluclator and it was something like 240W but even if ive stuffed up theres still alot of power left.

I installed new gfx card drivers but that hasnt helped, and the vpu recover doesnt go off to shut the gfx card down, so im completely lost. Ill get bak to you guys about the running temperatures.

if im honest, i dont think its overheating. Sometimes if i play cod 4 for a bit, exit the game, and then go back in, it will crash just at the splash screen when the card is at 40 degrees. The reason i thought power supply was because i read up that classic symptoms of the pwoer supply not coping was the spontaneous resetting that occurs when im playing.

Did you set the memory voltage correctly?
Test your memory with memtest86+.

Check the vendor's site for the memory voltage.
Go in the bios. The default for DDR2 is 1.8v. Adjust it on top of that.
It should be somewhere between 1.8-2.1v.