I followed this guide on my AMD RX 580 to mod bios (link below). Brought me from 24.5 MH/s (stock) to 28 MH/s. The only "thing" I don't like is the 100%
DaVinci Resolve 14: NVIDIA GeForce vs AMD Radeon Vega | Puget Systems
OWC Radeon RX 580 8GB PCIe Graphics Upgrade... at MacSales.com
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Mac Pro 4.1 > 5.1 + Radeon RX 580 8GB + OpenCore 0.6.7 Big Sur 11.7.7 | MacRumors Forums