Question Crossfire help

Sep 17, 2019
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My build is a ryzen 5 2600 with a b450 tomahawk cf rdy. With a corsair cxm 750w psu, msi radeon rx580 armor 4gb oc and a xfx radeon rx580 black edition. All the drivers and and software are up to date my system and radeon settings recognize both cards but when I go to enable CF in the game>global settings it's not there are my cards not compatible or am I missing something. Please help

Thank you