Have you found any good settings with afterburner on the Rx580 or tried a different display driver versions?
for the RX480 8GB I use settings are as follows:
AMD Driver 18.6.1
Global wattman:
Core 1300
Memory 2100
power limit -15%
Afterburner:
custom fan curve to equal 6200rpms as 18.6.1 global wattman only goes to 5200rpms
Friends RX480 8gb can clock 2200 memory, takes sols over 30. some cards are luckier than others,...
for beam?
dont mine beam. Those are the settings for all algos I mine, equi, ethash, crypto/lite/heavy. if I did mine Beam those would be the settings unless card became too hot, then id reduce power limit by 5% until stable.