http://support.amd.com/en-us/kb-articles/Pages/latest-catalyst-windows-beta.aspx
So... looks like this is only(?) for those 2 games I guess...
Highlights:
Crossfire Profiles updates for:
· The Witcher 3: Wild Hunt
(In addition to this graphics driver, there are additional manual steps AMD Radeon™ customers can take to further improve the performance of The Witcher 3: Wild Hunt. http://support.amd.com/en-us/kb-articles/Pages/Optimizing-The-Witcher-3.aspx ).
Performance Improvements for the following:
· The Witcher 3 - Wild Hunt: Up to 10% performance increase on single GPU Radeon R9 and R7 Series graphics products.
· Project Cars - Up to 17% performance increase on single GPU Radeon R9 and R7 Series graphics products.
Known Issues:
· The Witcher 3 - Wild Hunt: To enable the best performance and experience in Crossfire, users must disable Anti-Aliasing from the games video-post processing options. Some random flickering may occur when using Crossfire. If the issue is affecting the game experience, as a work around we suggest disabling Crossfire while we continue to work with CD Projekt Red to resolve this issue.
· Project CARS: Corruption may be observed if Anti-Aliasing is set to DS2M when run in Crossfire mode. As a workaround we suggest using a different Anti-Aliasing method.
So... looks like this is only(?) for those 2 games I guess...