Yep qts, I did all that, and I went one step further and went into the registery and removed ANY references or settings for the GF2. As far as my system is concerned, the GF2 never existed.
I am currently running at 1024x768, 32 bit, QUINCUNX antialiasing, mipmapping on and set to "blend" performance.
When the skies have no other planes around, I get 100-105 fps. FPS varies wildly while flying, anywhere from the 70's to as low as 35. I get the 30's and 40's when I am near an airfield that has some smoke and more than 3-4 planes around. Once it dips that low, it is constant. Granted, anything over 30 is fine, but I got that with the GF2 with same settings, except for the antialiasing. I fully expected the ti4600 to never drop below 60-70 except in really insane circumstances (like the start of a large mission or something).
Other than the ability to use QUINCUNX antialiasing, I havent really gained anyhting with the ti4600 performancewise. I'm a tad disappointed since this card costs $300.
I will try a total low level of my hard drive and reinstall everything and hope that clears up the problem....but either way, I am more concerned that this isn't aproblem once the new mobo, cpu and memory arrives.