hi,After a day having troubleshooting Big Sur (it was crashing on 2nd stage of install), I have a new EFI which works great including sleep. Getting great benchmarks all round.
Latest Experimental Patches
Aorus Elite X570
Sapphire Reference RX5700
3 SSD (triple boot Win, Linux & MacOS)
Hope this helps someone
Thanks. the strange thing is when I restart I’m only left with the option of reinstalling Big Sur or start my Catalina disk, thus the installation never gets after stage 1.Take a look at this thread for older gpus. https://forums.macrumors.com/threads/activate-amd-hardware-acceleration.2180095/