We used the full version of Counter-Strike:Source for our testing. All in game settings were set to their maximum apart from anisotropic filtering and anti-aliasing, which we varied for different portions of our testing.
Our benchmark is based on a custom demo recorded using the cs_militia map. There are a lot of trees on this map so it makes heavy use of transparency antialiaising when this feature is turned on.
We ran our tests twice, once with transparency anti-aliasing and once without to see how this advanced AA technique affected performance. The lighter bars represent our results with it turned on.