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You're kidding right? A GPU is way more powerful than a CPU. The tasks which they do makes them different. The GPU is more suitable for doing physics because it can do bulk calculations and video processing without having to outsource anything, making it the faster and more desirable choice for such a feat.If they had run the "physics" stuff that PhysX does on a modern CPU, the modern CPU (that's right, you wouldn't even need to run it on your graphics card) would kick its ass. It's just a fancy name for an inferior product marketed by a corporation with a whole ton of cash.
The downside is that is it can't switch between tasks nearly as fast as the CPU. So the GPU does repetitive work more efficiently than the CPU.GPU's have large numbers of ALU's, more so than CPU's. As a result, they can do large amounts of bulky mathematical labor in a greater quantity than CPU's.
https://en.bitcoin.it/wiki/Why_a_GPU_mines_faster_than_a_CPU