In the latest patch notes from Catalyst 4.7, they mention Anti-aliasing doesn't work with Prince of Persia: Sands of Time. I suspect it's because of the glow effects built into the game engine inhibiting the AA from working. Since I have a Radeon 9800 Pro, I can verify that AA does not work in PoP: Sands of Time...
Another weird symptom I've noticed is in Guild Wars, AA also does not work for Radeon cards due to the glow effects. I've asked numerous players and all agree that they don't get AA effects when glow effects are turned on for Radeon cards.
As soon as I get my new GeForce I'm going to test both of these games to see if AA is possible on that brand of card for these titles.
Another weird symptom I've noticed is in Guild Wars, AA also does not work for Radeon cards due to the glow effects. I've asked numerous players and all agree that they don't get AA effects when glow effects are turned on for Radeon cards.
As soon as I get my new GeForce I'm going to test both of these games to see if AA is possible on that brand of card for these titles.