driver(you should install this then install the latest caps even on single card systems)
Radeon Pro to create profiles and apply smaa(better then fxaa) the game cant use normal AA because it uses deferred lighting.
A note on SMAA, unlike the games built in FXAA smaa has no perf hit and dosnt cause blurring.
DownSampling Guide for AMD/ATI users
this lets you run the game at higher res then your monitor supports(like supersample AA) it also helps with FOV issues, I run the game at 2560x1440 on my 1920x1080 monitor its much better then default stock res.
good stuff for AMD/ATI users, specially the current radeon pro preview version with smaa...makes the game rock even more