Checking through RivaTuner my XFX 275 GPU has settings of 640/1404/1134, this is with "enable driver level overclocking" selected, my question, Is this as it appears, a "pre-selected" overclock?
The card cannot take any change from these settings without a video lockup (still has a picture, just no movement,app is Crysis)
Temps are in mid 50's C fan 100% 190.62 drivers. Is there a 64 bit version RivaTuner,perhaps this is a clue as it looks like I am running a 32-bit version (x86) with a 64 bit OS Win 7