I have an ASUS Maximus IV extreme z board
32 gb corsair RAM
I7 sand bridge processor liquid cooled
X3 RX 480 Strix graphics cards
It's on Windows 7 at this time. My Internet connection is deathly slow so I will have to take it to my mother's house in orderived to DL Windows 10 and updates (sad I know)
I was running 3 HD 7970 cards crossfire no issue. But when I did a clean install and updated for the new cards Crimson software shows them all but doesn't have the crossfire toggle. I've removed the sofare using DDU several time's and each time I have no way to enable crossfire. Even with older crimson versions. I have not tried the old CCC yet. I may wipe the system and reinstall windows 10 but because I live in the woods it's so time consuming to go somewhere and use their Net all day haha.
The CrossFire toggle is now located under Radeon Settings > Gaming > Global Settings. Have you checked this location?