i had the 9800 pro and just put the x850 in my machine, my frame rates stayed the same, what i noticed is the eycandy is alot nicer looking now but i do get alot of warping, and studdering, expecially when changeing looking around in my cockpit. dont know if its patch related yet though?
ohh and im running the latest omega drivers, as well.
when was the last time you updated you nif file for your monitor?