Well I left the AMD graphics family four years ago and one of the main reasons was that World of Warcraft was broken on Crossfoire/Eyefinity setup's. Moved to Nvidia and have had no issues.
Now I upgraded to a 280x to go with my 3 monitor setup, first thing I find - can't run full screen with DX11 enabled, have to drop back to DX9 - WTF it's 2014!
I'm in the beta for the Warloards of Dranor expansion and Blizzard have further pumped up the graphcs another notch so purchased another 280x and guess what - Warcraft does not use it, performance drops when crossfire is enabled.
AMD you really need to sort your drivers for WOW out this is unacceptible. User base may have dropped to only 6.8M players but this is still a big game and shoudl not have these issues.
Also having issues with BF4 in another post.
Intel 2500K @ 4.6GHz, 8GB Brucial Balistix Tracer 1866MHz RAM, 2 x 280X, Asus Sabretooth Z77MB, Corsair Force GT SSD, Windows 8.1