Quote Originally Posted by N19h7m4r3 View Post
Same.

When I went from my 8800Ultra to 4870X2, I never fully cleaned my HDD from the NV drivers and I had nothing but problems.

Clean OS install and Not a single problem with ATI, it's even my first ATI card.

If I install a new ati driver I uninstall the old one in safemode and remove any trace of it, then install the new one. Still no problems.
Had a 4870X2, 8800GTX, 8800GTS, 8600GT, and X1600XT in this rig at one time or another, never reinstalled the OS once and have had no problems other than bugs introduced by programs such as the "AMD GPU Clock Tool" or whatever it was called (it over-rides fan speeds and/or temperatures sensors).