hi, I want to upgrade my GPU from XFX 5770 to XFX HD 6950 and use it for cross fire. My spec: motherboard MSI 890FXA-GD70, CPU AMD 1100T, Corsair 16 gb 1600mhz, PSU 750 watts. SSD amsung 830Series 256Gb. Monitr Asus Ms238H 23 inch 1080P. I need it for Gaming and, it worth to buy that card for Gaming or use it for cross fire. HAS ANYONE HERE USE THESE TWO CARDS FOR XFIRE. PLZ HELP