Hello guys I need your expertise, please help: I've just bought an HD 5950 graphips card with unlocked shaders and memory clocks, so it operates as an HD 6970, and when I play it keeps freezing out. My CPU is an AMD Phenom II X4 965 (3,4 Ghz). What do you think, can the reason for this problem be my noname (HKC) 550W power supply unit? Thank you very much!