I installed new gtx760 wit latest ownload drier it works normal but i try to play heavy game it restarts ---My system ---PCU-500wat --Procssar core2due E5400 3 gh--Motherboard -Intel.DG41WV---System Bus speed1333-Mamory Speed1066--Fan-RPM 2580 ---Ram-4gb ddr3 Bios date nov2009 cac somebody tell me the salution---AKHTAR Pakistan