Here we're able to find out when PhysX is turned on in games that support it what kind of frame rates we're able to get. We always set PhysX to the highest possible in game settings while also keeping detail at its highest.
Under Mafia 2, a very new game, we see the GTX 460 gets a nice little bump across the board. Under Batman AA there's very little change. The GTX 480 on the other hand manages to see a nice bump in both games at all resolutions.