You didn't note:
1. The BIOS is latest.
2. The power supply is a monster (try 450 Watts)
3. Removing the case cover helps.
4. It's new. You have warranty, use them.
I just built my system and everything is new. When I load 3d games, sometimes it plays perfectly. Other times, the monitor will black out and the sound will freeze, and I will have to restart my computer. This has happened in two different games (deus ex and soldier of fortune 2), so I do not think it is the software. I have the newest drivers. Here is what is on my computer:
a-bit nf7-s mb (w/soundstorm onboard audio)w/ athlon xp 2600
gainward ultra/880-tv-dvi geforce fx 5700
seagate 7200 rpm ide drive on a serial ata adapter
Incidently, I ran 3dmark 2003 with no problems at all. I have tried these programs out with different graphics settings, and none seem to affect the crashing one way or another. any help?