Big Sur on AMD R5 3600, RX 5500 XT, MSI B450m Mortar. Reading, understand and carefully following the Dortania's OpenCore Install Guide is the key. Still waiting for it to crash/freeze but
RX 5500 XT 8GB benchmark with Ryzen 5 3600X 1080p, 1440p, Ultrawide, 4K benchmarks at Ultra Quality - GPUCheck United States / USA