Open source is known to perform horribly with AA enabled. I wouldn't use it. Just crank up the resolution as high as you can. Usually 1080p with FPS games like TF2 is good enough without needing AA since you don't have time to see jaggies--just kidding! Really though, I'd rather forget about AA and Catalyst and just live with some jaggies and the open source drivers.
Originally Posted by Espionage724