hi i bought my new pc about a month ago .. i got i7 920 MB Asus P6T Corsair Ram 3GB @1333 PSU Silver stone 650w GPU EVGA 275GTX Superclock i am having a problem that my pc restart while playing games ...i check everything but dont understand what is the problem .. nothing is overheating everything is working on default clocks ..nothing is overclocked ..... first my brother was playing Mass Effect 1 when thins start happening ....i was thinking something was overheating i increased GPU Fan speed then it was fine .. but next day i was playing Age of Empires 3 again my pc restart ...then i do some cable management then everything was fine ... now it is started again after few days ... i was playing crysis first it was fine for about 3 hours then a restart ..i started crysis again but this time pc restart after 15-20 mints .... pc is restarting after 15-20 mints while playing games.... GPU max 66c @80% fan speed CPU max 78c and AVG is 70c for all cores
power supply unit will most likely be the issue. I've had this problem myself pc would restart after 25mins either a overheating psu or gpu using to much power.