During recent days, you could see a fierce battle between AMD and Nvidia PR teams over Batman: Arkham Asylum and the fact that PhysX and AA works only when you run it on Nvidia GPUs, while on AMD cards the game worked, but without the in-game AA.
Nvidia's team worked with developers and designed the AA engine by themselves. That's a clear fact, and thus the game does indeed look better when paired up with an Nvidia GPU. On the other hand, AMD's PR team is adamant that Nvidia had a lot to do with the fact that the game simply doesn't like AMD GPUs. According to a statement made by AMD's Ian McNaughton, AMD did provide the developer with a solution, but it didn't make its way into the final release of the game.
