2x Graphic cards ?

Can a computer run 2x graphic card that are not the same models ?
Current one i have : Radeon 5770
Adding another one : Radeon 5870
How much more is it gonna boost my fps by ?
Knowing that i currently have 450fps in 1v1 with the Radeon 5770

Yes , replacing the cpu is better BUT my current CPU is an i7 4ghz so
I dont think i need to replace that , Also have 6 gb ram .

P.S : If you don't know anything , please dont post , thanks.

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