Asus S939 Nforce4/PCI express
Athlon 64 3800+
1 Gig PC3200 DDR-400 SDRAM (2 512mb sticks)
250GB Sata2 HD
Nvidia 7900GT 256MB
2 16x DVD-R/RW drives
1 Floppy Drive
300W PSU

Recently purchased, and worked fine for a little bit. But as of recently, in most graphic heavy games I play, it will either CTD or outright reboot my PC. Always kinda took PSU's for granted, but is the low wattage the most likely culprit of my problems?

It's not nessessarily the wattage you have to look at, but the amperage. The higher the better. Read up on it. Goto newegg.com and read the specs when you choose any power supply.

Its definatly the PSU. Nvidia recommends at least a 350W psu for the 7900GT. I would suggest purchasing a quality psu 450-550W from Antec, Enermax, OCZ, ect.

With that video card, the minimum required psu is 450w. I'd say you are definately having problems due to the Powersupply. You can get a decent 550w Antec off newegg for less than $100 dollars.

hmmm.....on the side of my 7900gt box it says minimum required PSU is 450w. Must be different than on Nvidia's site.

I've been looking into buying this one.

http://www.newegg.com/Product/Prod [...] 6817103931

That is a very good PSU. I've had the same one runnin in one of my systems for over a year now, and it still runs great.

Groovy. Just put an order in for overnight delivery. In by Tuesday I hope. How difficult/easy is it to install a new PSU?

it is easy enough to install a new psu, however, i am wondering how you came about that one you have.

did you build the comp yourself and just use the psu that came with your case or did you either get it built for you or did you and this i hope ain't true, buy it yourself

The PSU came with the PC I bought (customize the parts kinda deal). I've never purchased (let alone installed) a PSU by itself before.

hmm if you had no choice in the psu that came with that comp i would seriously tell them they are doing somehting wrong. who did you buy it from. you should sue them or at least report them to a trading standards body and i am being serious. that is knowingly selling a bad product and. it is the same as selling a car with the wrong type of brakes. frankly i am shocked.

No, I had no choice in the PSU at all. And now that I've gone back and checked, the case/PSU was never mentioned at all in the on-line invoice when I ordered. I only found out by looking at the receipt that came with the PC when it was delivered (has a list of parts including case/PSU). Foolish me for assuming they'd give the computer a power supply that it requires to operate properly.