Yup. That's basically what they do. The same thing a graphics card does for graphics. You don't need them, but they're supposed to allow newer games to have mind-bending physics or something, and improve the graphics by doing things such as calculating where each and every piece of that glass you just grenaded lands.
They are worthless, at least now. Maybe in a few years when games support them and the price comes down. But until then I wouldn't spend my money on one.
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You can give a man fire and he will be warm for a day but set him on fire and he will be warm for the rest of his life.
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Creator of the Star Trek Mod - AST Mod - 78 Ship Sets - Conquest Mod - Atrocities Star Wars Mod - Galaxy Reborn Mod - and Subterfuge Mod.