Physics Cards are not to improve the graphic. They are designed to calculate the movement of objects, fluids, gases etc... They relieve the CPU not the GPU. CPU is not designed to calculate such things.
However basicly it will improve the graphics in some way. Explosions, Fires and Fluids looks much more real. Objects that are being destroyed look much more realistic. Many things can be moved and fly around at same time.
in example you can have a game where you see cars crashing in each other and you can calculate the deformation in real time making every crash look different.
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