I have a AMD 64bit 3200+ with 1gig DDR memory Kengistion matching, ASUS K8V Deluxe motherboard, PNY FX5950ultra 256bit Video card, 500watt power supply, all compents are updated with the latest drivers. When I game with this PC it completly shutdown and have to reset the main power supply. The Heatsink has great thermal barrier on it and does not run hoter than 50c under extreme gaming. I am pretty good at knowing how and why a PC functions did alot of research in google and forums but I cannot find the culpret of why it shutsdown. If someone can suggest some opions I would be greatful.