Lets not forget that Nvidia purposely forces CPU PhysX to only work on 1 core as to demonstrate how pathetically slow it is and how you NEED a gpu to do PhysX and thus need to buy nvidia cards.
However there is a hack out there that properly distributes PhysX to additional cores, the ones that are 95% unused in most games, and it flows beautifully, regardless of whether you have ati or nvidia.
Get the hack, enjoy physx and give nvidia a big finger.
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