Just to add I was playing Farcry 4 with Crossfire enabled early on. Disabled all Gameworks stuff and it was running very smooth avg I say around 90fps.
If I was to enable Gameworks the game would show signs of stutter soft shadows being the worst.
What do you mean by Gameworks stuff?
I have tried FarCry 4 with Crossfire, and find performance very poor with AA. SMAA is acceptable, but produces very distracting visual artefacts - which Ive found from other forums is due to the lack of a proper profile.
I'm running at 6000x1200, so really need crossfire to be working properly.