hi guys i have a msi 990fx gaming mother board i have a msi 760 and just got given a asus 760 i cheaked the spec and as far as i can tell they are compatible. i have instaled them into all 3 slots in differant orders and tryed a differant bridge to see if that was the problem. both cards work on there own and show up in the nividia ocontrol pannal but it wont give me the sli enable option any help please