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I upgraded from a 7900GS to a 8800GTS and now in WoW my fps have gone from 40-60 to 30-40s and when i have it windowed it went from 30s to around 10 fps or less.
could this be my psu not supplying enough power ?
its an Antec SmartPower 2 500 watt
Its a driver problem.. Use a program to remove your current drivers and reinstall the current ones.
I had the Exact same problem , and ATI tools helped me a alot. with the rotating cube thing.
and it is a 100 % a driver problem , unless you have a weak CPU that also hurts the FPS.
Im just throwing this one out there, but if your running an SLI mobo try running your card in the other slot.
Its worth a shot.