Since 1 year ago almost all AAA games released doesn't support crossfire. I have 2 r9 280 in crossfire and 90% of the games im currently playing only use 1 card. I could be getting 60 fps easy in high settings on every game and because no crossfire support have to play at 30-40 fps. What's happening these days that amd stop to release drivers that enable crossfire support?
Well.. If you look at the state new games are on day one and a couple of months after it's no wonder there's no CF. They have all support staff working to get the daxx thing working as it should.