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I don't, but then, in a typical sli setup, video performance is increased 60-90%. That translates to 0-75% increase in framerates. Remember, some games don't support sli, so you might not see any performance increase in some games.

i don't but it will enhance the graphics alot and provide lots of better resolutions but a draw back. you need special parts like motherboard with 2 PCI-e x16 and a crossbridge to work it along with a good power supply. Good luck