I would like to report an issue:

rx570 4GB cards with tuned bios, win10, latest AMD driver (adrenalin 20.7.2) - no mining after changing epoch to #352

Only first card shows 10 mh/s, the others fixed at 0 mh/s.

Normally around 30mh/s.

update: First test shows that lowering memory speed and getting back to very old crimson beta driver helps for now, at the cost of 3-5% lower performance. Memory usage around 3,895 MB

HWinfo shows that old driver is using around 27-29 MB of dynamic D3D memory while new driver is using more then 130 MB, at least for me.