Yep I've seen you can do 1 for physx and 1 for graphics, but not SLI on AMD boards which is still nice as I can only afford 1 nice card for gaming. That will let me use cheaper card for physx or when I upgrade will use the card I've got now running games, will probably wait till some more games benefit from it though.
I would get at least a 9600gt or 9600gso, I would make sure that the gso has DDR3 on it though. I seen an article on adding a second card for physx and if you use a lower card on a high demanding game it will slow you down, slower than using a single card for graphics and physx.
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