I might be doing something wrong but the latest radeon drivers (19.6.1) have halved the mining rate of my Vega 56 but not changed the rate of my RX580.
Any ideas anyone ?
Make sure you are running compute mode on the rx580
-y enables Compute Mode and disables CrossFire for AMD cards. "-y 1" works as pressing "y" key when miner starts. This option works in Windows only.