My Asus EAX800GTO crashes when running 3dmark05. The computer usually reboots, if not, the screen freezes. I installed Battlefield: Vietnam, and the screen freezes as soon as the menu screen is reached (which shouldnt be graphics-intensive?) I've run memtest without failure, all my drivers are up to date. I have Windows XP Pro/SP2, and already I've installed the AMD X2 drivers and the Microsoft dual core hotfix. I'm pretty sure it's the PSU or the Graphics Card that's the root cause. My PSU is rated to 420W, made by "TCStar". In speedfan, the voltage readings are: Vcore1: 1.34v -1.36v Vcore2: 2.67v stays constant +3.3v: 3.41v +5v: From 2.01 to 4.41, extremely large fluctuations. I have all my fans connected to one molex connector, is this why? +12v: 12.10v No change at all, very constant. -12v: -6.52v, -3.89v only shows those 2 readings. -5v: -1.28v, -0.78v keeps changing +5v (again?): 3.3v, 4.8v, large fluctuations as well VBat: 4.08 constant. Can anyone please explain what those readings mean? I don' t know much about PSUs. Setup: Everything is brand new. Gigabyte GA-K8NF-9 Motherboard, newest revision with the passive chipset heatsink. F10 BIOS. AMD Athlon64 X2 3800+ Dual Core w/stock heatsink and fan. 2GB Transcend RAM (4x 512MB), timings 3-3-3-7. Running in dual channel. ASUS EAX-800GTO graphics card, not overclocked. Seagate 7200.7 160GB Hard Drive, SATA. TCStar 420W PSU Sony DVDRW Drive Mitsumi Floppy Drive Thanks.