very bad idea. gfx solution = visual display only. its limited to just displaying on screen what happens, and at the cost of gpu bandwidth at that. its a one way road. seprate card means that it feeds the data to the GPU and CPU, meaning that that crumbling building will accually kill you if it lands on you.
with you knowing so much about graphics cards, physics cards, the gaming industry and hardware in general, you really should set up a rival to NVidia because those idiots are already developing one!
If NVidia get a GPU AND PSU on the same card then their pure brand power will most likely destroy anything else, it doesnt matter whether its pulling processing power from the GPU or a seperate chip altogether, i'm sure they know a lot more about this than anyone here does.
Yes think of all the possibilities of limitless physics and the impossibility of designing anything that supports it, every idea so far is pure sandbox stuff.