I've been having trouble with my HD 7990 card for some time now. The only way I can get both GPU's to run while gaming is by using very old drivers(13.9). I have no option with the latest driver (Crimson 16.3.1) to activate crossfire and it says the 2nd GPU is disabled. I use Afterburn which gives the option for in game monitoring of your graphics card performance. Whilst gaming in Battlefield 4 the 2nd GPU isn't doing anything.
I have checked the registry, and crossfire is enabled. How can I get the 2nd GPU to become active?