For my 280x's it works on adrenaline 18.x.x (windows 7), 17.12 (windows 10) and older crimson 15.12 (windows 8.1). Only for some reason (RAM issue, may be?) I have to restart the miner manually 2-3 times to begin mining. Speed is around 20 sols.
This morning I tested again. My RX 580 is working at 12 sols with accepted shares (adrenaline 18.x.x (windows 7)). All my 280x give invalid solutions (17.12 (windows 10) and older crimson 15.12 (windows 8.1)). Those with 6GB even work at 70-ish sols which can't be true. 3GB work at 15-20 but never have accepted shares.