I optimized my RX570 nitro+ with 4GB Hynix, got about 138W power consumption. My parameters: BIOS parameters: 1150GPU/2060Mem/0.9V Mem/0.86VGPU. Got the best results with a custom strap, not by copying the existing 1500 strap above. These data are generated with EthOs not Claymore. During tests with claymore I got hashrates of about 29,6Mh/s by using the same parameters.With EthOs max. 27Mh/s only.