System Specs.

i5-2500k, 16GB Mem, 256GB ssd and 2 pcs of 7750.

OS is updated from windows 7 to windows 8

7750(single or CFX) output only on monitor(22") with DVI,

GPU integrated in CPU output on monitor(19") with onboard-hdmi

one the other USB-monitor using displaylink's driver.

(catalyst ver. 12.10 now..)

in this system.. on win 8, set the 7750 * 2  to CFX ,

amd crossfirex didnt work properly....

even if I use the AFR mode, all the games i've playing have same FPS 

as single 7750 ....

game list what i play below here

Blade & Soul ,

World of Tanks,

League of Legend (this game, got the crash every time on round starting screen... if i set the CFX...)

is there any way to solve this problem?