Can you please help me? I have a couple of RX 570 8gb RS XXX (exact model RX-570P8DFD6) Hynix memory, tried 10 bioses, whenever I undervolt the card, it is crashing on SMOS, this is the only stable setting but it is too much power.
Heck I event asked XFX official support to sent me their bioses, tried them stock, modded with polaris bios editor (the straps with one click) still same results

Max and stable OC settings:
Core clock 1140
Mem clock 1900
voltage 1087 (default if I lower it the rig crashes)
PowerStage 3
Aggressive undervolt off
29 mhs for 150watts
As I said above mining on SMOS without risers, directly on a new motherboard so the hardware is not faulty.
I had exact same cards, most of them could do 30,5~31 but with following settings in OverdriveNTool under Win