Just installed the new 16.8.3 and I can't run anything in crossfire without it lagging at about 1 fps. CSGO doesn't even launch.
I can disable crossfire and it works fine with my 3 monitors. As soon as I turn crossfire on, I get the same issue. Windowed mode works fine. Disconnecting 2 of my monitors fixes everything as well.
Didn't have this issue with catalyst drivers 15.12 etc.
I needed the new drivers for BF1, and they work perfectly for that, crossfire, full screen with all my monitors connected. However, no other games can run like that.