i use OCCT to stress test.... just make sure the temps don't get too ridiculous and the you dont get too many errors too fast... oCCT is very very strong stress test so errors are bound to come up eventually
------------------------------ E6600 @ 3.6, 2 X HD4850(680/1150), OCZ 4Gigz
Reply to xc0mmiex
Prime 95 and OCCT stress the CPU not GPU, the best bet for you is to use ATItool and use the arifiact window in it. overclock until you start seeing artifacts(abnormalities such wite cots or lines) that is pretty much the max stable for long periods of time, you can push further but it will not be 100% stable
------------------------------Core 2 duo E6750@ 3.72ghz,Geil ultra 2gb 800hmz @1050mhz 5-5-5-15,
Asus P5K mobo,74gb raptor,250gb WD sata hdd,
His ICEQ 4 4850 512 Turbo,Pioneer sata 18X dvd writer,