i would look up graphics processor unit or video " " on wikipedia if i were you, to get a good idea on how they work, but basily the gpu performs the rendering of shaders just like the cpu performs number crunching processes, the more powerful your gpu - graphics card the more intense and high resolution textures you can run. if you attempt to run high quality textures on a underpowered card, you will result is bad framerate or even unplayable
also different generations of cards support dx10, differnet open gl lanuages and shader models.
i suggest you wiki " gpu, vpu, direct x, shaders, graphics acceleration"
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