I wish it could, but I'm sure it doesn't
I as well want a card to speed up rendering, but they cost a packet. My only chance is setting up a farm really with old CPU's lying around.
That physx card is only to be used when running physics, so will be useless for 3D rendering still I believe.
I'm sure in the future though, as we get more processors linked up together, like quad CPU's etc, we'll see an increase in speed.
The only way the Physics card could speed up he 3D process at all, would be for the computation of the physics, but in 3D Studio Max for example, its Havok built for Reactor, which wouldn't work anyways.