OCing can use a significant amount of power. it can increase the wattage use of your GPU by 20-40w at 100% usage. (this makes the 5770, a ~150w max card nearly a 200w card) and yes, my old coolermaster PSU would overheat and shut down if i tried running a stress test after OCing my GPU, but i could play crysis warhead and run stress tests at stock clocks without issues.
Sure, I heard furmark stresses much more than normal games or benchmarks.
this is true. furmark pushes the GPU much further than games will ever reach. this is why you should only need to run it for 10 mins max. if you see no artifacts or freezes, your card is doing well. you should also run some games because some OCs will appear stable in stress testing but might fail at normal usage (30-70%). so after you run furmark or another GPU stress test, play a graphics intensive game for ~30mins. if you have no issues, your OC is probably stable. just keep an eye out for lock ups, freezes or artifacts when youre playing because only time will tell you if your GPU is stable at your OC settingsEdited by IntelConvert - 1/14/11 at 12:34am