Are you looking to run a dual graphics card setup??
It is my understanding that this board is suppose to bring SLI to AMD on an AMD chipset. If you are planning to run a single card and a second card for PhysX, you befind either way since not in SLI (no bridge). The cards act independent of each other so it is all based on the Nvidia Drivers.
To be more clear, if I were to run two NVidia cards (say two 480s) using the Crosslinx 3/Hydra Engine technology, could I use 3D Vision* in that setup?
*PhysX is a lesser priority.