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Evil within was fixed in the 16.30 drivers aka AMD Radeon Software Crimson 16.7.3 I believe and it wasn't something simple to fix since that game was doing something in an odd way which didn't show up on older hardware.
You can't crossfire a Fury card with RX 480 cards, You can add a fury card to your system on its own however for games which allow you to pick which GPU to render to instead of the Crossfired 480 cards. Not every game allows you to pick the GPU.
Windows detects the GPUs in its own order so there isn't a way to define which of 2 Crossfired cards is the master and which is the slave.
You have to expect some bugs with brand new hardware IMO.