Another driver release from ATI spawns another performance comparison for TweakTown. Along with the addition of Adaptive Anti-Aliasing, ATI promises some performance improvements in a couple of games. Probably not the games you were hoping for though.
"Apart from the performance improvements you can see below, Adaptive Anti-Aliasing has been added to the Radeon 9550 and above models. Originally Adaptive AA, which is a feature which adjusts its detail level depending on the performance, was only seen in the X1000 series of cards."