Success with installing Catalina and High Sierra. Used the OpenCore Vanilla guide.
Hardware is blazingly fast, single core score is 1300, which is faster than most iMacs and MacPros money can buy.
MultiCore Score is 12397.
G.Skill 3600 64GB RAM had to be replaced with Kingston. G.Skill did not work in the motherboard when 4 modules were installed - it became unstable.
Things I still need to fix:
- Access to iServices and AppStore
- Thunderbolt 3 (if possible)
- Onboard audio (think this is relatively easy - just need to find the right protocol number)
I also need to install a FireWire 400/800 PCIe card to get connectivity for the Universal Audio Apollo interface.
I'll update this thread with progress.
Thanks to all, especially @Rasmus on Discord for helping me out.
AsRock 570X Creator
64 GB RAM
Gigabyte Auros RX 580
Corsair MP600 nVME 1 TB
Samsung QVO 4 TB (2 pcs.)
WD 8TB 7.200 RPM
Standard ATX Cabinet with some RGB fun
Corsair 850W PSU