Tomshardware did an article a few years back on PhysX.
They found that PhysX on CPU/Non-Nvidia GPU used x87 instructions. x87 is ancient, and much slower than even SSE2.
Edit: http://www.tomshardware.com/reviews/nvidia-physx-hack-amd-radeon,2764-5.html
Alsom this was checked by David Kanter
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