I wonder if anyone has successful enable 2nd or 3rd GPU on the Crimson. How did you do it? my cards are HD 8990 and HD 7970. I got them to work in 15.7 but no other Crimson drivers show them as linked.
Have you enabled AMD CrossFire in Radeon Settings > Gaming > Global Settings?
I have the same problem. The option Crossfire isn't even there in Global Settings.
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