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.
While Batman AA performance is strong, you can see setups that don't have a dedicated card for PhysX do indeed struggle under Mafia II. As good as PhysX is, it just hasn't taken off yet and isn't a major selling point for people when buying a card. Instead, the raw power is, and NVIDIA do a good job with that.