PC Games Hardware checked how the performance of the PC version of Batman is affected by the additional Physx effects. They also took comparative screenshots that demonstrate the different Physx settings.
According to their benchmarks the medium Physx effects almost halve the framerate. The high settings on the other hand only require a little extra power.
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Strange I have the game running with similar setting with an overclocked 260 gtx and I'm getting similar benchmarks with physx on high. 51 Average, 26 minimum. I would have expected more from a 285 gtx.
Adding a dedicated PhysX card actually gives a very nice performance boost in Batman: Arkham Asylum.