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You have never needed a nvidia card for physx. ANY game with physx you can have it offloaded to the cpu instead taking a identical performance hit as if I had a Nvidia card, less actually. See Physx on cpu sucked back on dual and single cores. Now adays with 4-12core cpus its not a issue. So dont buy into the Nvidia hype. You have never needed a nvidia card for physx, nor will you ever. Game devs just lock the option out for us AMD guys but a simple ini change fixes that. Enjoy!
C:UsersUSERNAMEDocumentsMy GamesBorderlands 2WillowGameConfigWillowEngine.ini
For those wondering I have a 6850 with a i5 2500k