AMD and nVidia are both guilty of anti-competitive practices -- that's what optimisations for a specific card are all about. Competition in this way rather than on price hurts buyers.
PhysX and CUDA are examples of anti-competitive practices as well. Nvidia want gamers to hold on to old CPUs and buy new GPUs to cement their control of the market. CPU power is very cheap compared with GPU power, and physics belongs on the CPU.
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