intel e8400 3ghz
2gig ddr2 kingston 667mhz
one 120gig hard drive 7200rpm
one 80gig hard drive 7200rpm
asus 8800gt 512mb
motherboard: asus p5k-vm
case: antec 3 hundred
If it isn't quality, 500W is not enough. JonnyGuru did a roundup of bargain bin power supplies, and they had a cheap PSU that said it was rated for 650W die at 184W of load. Most died before rated load, and getting near that point had voltage ripple way outside of ATX specifications.
Can you give us the exact model of the power supply?
Edit: beat me to posting, the Earthwatts are a great line of PSUs, cheap, SeaSonic built and high-efficiency, it will have no problem with your setup.
Message edited by gravemind123 on 07-09-2008 at 05:27:43 AM