System specs
- MacMini 2018, i3-8100B CPU@3.6GHz, 8GB RAM, 128 GB SSD, Intel HD 630 1536 MB
- Mojave 10.14.6
- Windows 10 Bootcamp 1903 V1
- 26-inch (1920 x 1200) LG W2600H
- External USB3 SSD
eGPU hardware
- Sapphire GearBox
- Sappire Radeon Vega 56 8GB
- USB-C to HDMI switch
Hardware picture
Installation steps
- MacOS = plug and play
- Win10 1903 V1 = After clean install with Bootcamp drivers and autoupdate disabled it is necessary to configure and test on second computer or mobile phone the RDP connection (Remote Desktop Protocol). Shutdown. Connect eGPU TB cable and start straight to WIN10. Result no screen. Run the RDP on second computer and login remotely. Everything has to be configured and drivers installed via RDP (if you prefer TeamViewer it is also usable). After Adrenaline installed simple reboot with everything connected. External screen will start up with login screen.
Benchmarks
Unigine Superposition
Unigine Valley Benchmark
Luxmark MacOS
1. Macbook Air 13" 2014 + Sapphire GearBox RX570 (optional GTX1050Ti).
2. MacMini 2018 i3 + Sapphire Gearbox Vega 56.
2018 Mac Mini [8th,4C,B] + RX Vega 56 @ 32Gbps-TB3 (Sapphire GearBox) + macOS 10.14.6 & Win10 [build link]
Thanks for that. I will try to do it your way 
Until now I had no luck making it work Hope there will be no issues on Catalina 10.15.6.
2018 MacMini (3.2 GHz 6-Core Intel Core i7, 32GB Ram) + Razer Core X with Sapphire Vega 64
Hi. Did you success? I bought secondhand another Mac mini 2018 with 10.15.7. I was able without any issue replicate the boot camp setup via RDP. No error 12 no issue. Software switching between win/mac os works perfect.
1. Macbook Air 13" 2014 + Sapphire GearBox RX570 (optional GTX1050Ti).
2. MacMini 2018 i3 + Sapphire Gearbox Vega 56.
2018 Mac Mini [8th,4C,B] + RX Vega 56 @ 32Gbps-TB3 (Sapphire GearBox) + macOS 10.14.6 & Win10 [build link]