Soldato
People were complaining of poor Crossfire performance in the game Dying Light. The developer, Techland, have released a game patch which has corrected these performance issues. The patch should automatically download on Steam.
(Windows only)
- Fixed performance issues for Crossfire hardware setups
Source
http://steamcommunity.com/games/239140/announcements/detail/240158195511841438
And that finishes my point early on that amd isn't always to blame for crossfire.