[ss248]

>Whatever happened to dedicated physics processors?

Nvidia bought PhysX and stopped production of dedicated PPU. PhysX is just software now. And because it's proprietary (no AMD cards support/CPU implementation is slow) we don't really see games build around it.

[goldenkey]

GPUs or CPUs can be designated as PhysX devices within the NVIDIA drivers. Im not sure if that rules out using AMD devices but probably.