Does using SLI to combine graphics cards essentially double your GPU power?

Q: Additionally, do they have to be the exact same graphics card? (i.e. same manufacturer (EVGA...) and GT/GTX.

A: yep in short it does but technically it depends on what your useing it for, getting twice the speed depends on how the game your useing it for works and how it is programed, newer games like crysis will deffinatly be able to use both graphics card but if the game was made for x-box then ported to pc like splinter cell double agent then you wont get double the speed but games like splinter cell and halo probably don't need that much speed. and yes they do have to be exactly the same.

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