as it is written on the first slot x6 at single and on second one it is written x4 ??
mean i can only gain 25% performance of the single gpu?? according to x16 , x4 rules? :(
In a crossfire setup, you will run at x16,x4 which will show about a 5% decrease in performance from x16,x16. Typically, I don't recommend running a x16,x4 but with 5770's you will not see enough of a decrease to worry about.