2017 21" iMac 4K (RP560) [7th,4C,K] + RX Vega 56 @ 32Gbps-TB3 (Sonnet Breakaway 550) + macOS 10.14 & Win10 [semohe] // on external ssd
Installation steps (what did you do to get it all going?)
For Mac Os Mojave is just plug and play, you can use it with internal or external monitor or both just great
For window 10, i spent 1 week to finally make it work. the problem is with the error 12. and after following Mikael's guide the error 12 is gone. it works with external ssd windows 10 boot. for now i can only use external monitor for windows 10.
internal monitor on mac
external monitor on windows 10