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.
With PhysX on you can see across the board we're not able to hit a 60 FPS average. You're really going to need something higher up under Mafia 2 if you're really interested in PhysX.
Batman Arkham Asylum
Batman AA also struggles at some points. Fortunately it's only at 2560 x 1600; below that we're above the 30 FPS minimum we need to see.