Hi ppl Specs first: Intel Celeron 3GHZ 1 GB Kingston PC3200 Gforce 6600GT MoBo: AsRock P4VM800 Nothing is Oc'ed atm. I builded this computer myself, i think its my 3rd build and i havent had problems like this be4. Whenever i play a demanding game my PC reboots after 5 min. If i play a lesser demanding game like wc3 i can´sumtimes play 30 minutes, other times only 10. In JK2 i never experinced a crash, neither in Dungeon Siege 2, which is wierd cuz its more demanding than wc3. In UT2004 i only crash if i play a map with vehicles, i think that is caused by a bad install tho... Any Ideas? I checked the temp. for both my GPU and CPU, and none of them get above 50-55 degrees. I tried new drivers for my graphic, old and newer without any luck. Everything in my computer has been replaced, except for my hard drive, but im pretty sure this happened after i replaced my RAM which was the last thing i bought. when i check my RAM speed in my BIOS is says 166 MHZ. This doesnt make any sense, i got 1gb og kingston PC3200 DDR400, or sumthing like that, deffently 400 MHZ, but 166 * 2 would be around 333 MHZ. I checked my Specs for my mobo and it says that DIMM 1 can go with 1gb of 3200 and DIMM 2 with 2 gb of 2700. Does this mean that if i use both, i can only run with 333 MHZ?