I have a new graphic cardd, it's a HIS ATI based HD 5870 iCooler 5. When I play a game, after 20 minutes, the complete system shutsdown (it's not really shuttig down, but the computer goes off like a crash). The minimal requirements are a PSU of 500 watt, I use a 430 watt PSU. Can this be the reason?
Edit: When I tried FurMark, the system shuts down immediatly, Could it also be a problem with my CPU core temp?
Update: The problem was indeed the voltage, I replaced the PSU with a stronger one, with more amps on the 12 volt connectors. Now I don't have any problems anymore.