I am running a AMD Phenom 1090T Black Edition, 16GB 1600 Corsair RAM, 2x HD 6970s tested in both XFire and non XFire setups and using a Windows 8 64-bit OS.
I tried: completely removing and uninstalling my catalyst drivers, then installing them again. Removed a hard drive that had been causing me slow down issues (it helped to do that anyway, but didn't affect WoW really) then I followed some advice from a thread that was about the same issue back in 2011, and I did a selective startup, getting rid of any unnecessary processes and ran the game from 0 cache, addons or WTF.
Guess what, still there!!
So, at this point, tired, frustrated, and a little bit angry that my machine which scores just fine on much higher graphic benchmarks, cannot run WoW steadily at at least 60 FPS.
I rarely try and place blame so directly but... BLIZZARD, FIX YOUR S**T!!!