Hi there chaps :D
I've got XFX Radeon 5970 Black Edition, Intel Core i5 750, 8GB G.Skill Ripjaw 1333 in Dual Channel, Antec modular PSU 650W and exactly the same problem as f0rcerec0n.
It's got nothing to do with your processor, mobo or PSU. It's all about ATI display drivers. The company is...