Hopefully this is the right section for this.
So I recently built myself a new PC. It has Windows 7 64-bit Home Premium, an AMD Radeon HD 6870 graphics card, an Intel i5 2400 processor clocked at 3.1 Ghz, and 8GB of DDR3 1666 Corsair Vengeance RAM. The machine works very well with Fallout New Vegas, which I can run at "High" (4 sample AA, 8 sample Anisotropy, HDR, 1920x1080 res, etc.)
KotOR 2, however, runs horribly. I installed the game according to the instructions on Lucas Forums. The game starts up fine and there are no crashes. It's the actual gameplay that is extremely laggy and low-quality. I'm positive that all of my drivers are up to date. I've done everything suggested in the "Tweak" guide. Problems occur on every possible setting, both in-game and in the AMD Catalyst Control Center application. The only thing that worked was rolling my Video Card driver back, but that's problematic since I play other games that require the latest driver.
Can someone help me out?