Not work for me 5.1C, same problem, he dont mine with 4 gb (RX570)
Miner close itself after
GPU1 Light cache generated in 3.6 s (16.8 MB/s)
I get only 10mh.
Computer mode
I have win 7 on rigs with rx470(4GB) and rx570(4GB) cardsand tried different (newer) drivers and I don't have compute mode option.
I enter Gaming, global settings, but after that I don't have GPU workload (graphics) option, so no compute mode option.
My other rig rx470(4GB) and rx580(4GB) working fine.