You know, the Physx card hasn't been released yet has it? I believe that 06 may have support for it in the benchies I was watching the credits for the program at the end of the demo and I believe that Ageia Physx was listed as a big contributor.
I believe that is is designed to work with it, and it supposedly works with some of the games currently out(i think). But the reason that the card has not been released was tat the company believed that the market is not ready for a physics card because there is not enough demand for it and if it was out not many would buy it so they desided to delay it.
But when it comes out, I think it should help 3Dmark06 prettty well