Why would I get a card that features PhysX, especially a card that actually costs $350 because it has a dedicated GTS 250 GPU just to handle PhysX? (Main GPU is a GTX 275). In the first place, is this really a must-have application for gaming? I don't think so.
http://www.electronista.com/articles/09/11/03/evga.first.to.combine.graphics.physics.gpus/
http://www.electronista.com/articles/09/11/03/evga.first.to.combine.graphics.physics.gpus/