Greetings. Recently I managed to get an unique Engineering Sample Radeon Pro Vega 20 card for my collection. I took some photos and wrote a post about it on my site (Radeon Pro Vega 20 ES | VC Collection | Сайт о видеокартах ).
It based on Vega12 GPU and actually works, but I cannot find an appropriate driver for it to run 3D. I tried Adrenalin and Apple Boot Camp drivers, but Win10 just doesn't want to use them for that GPU.
If anybody there could tell more about the card (its origins, purpose of all that connectors, etc.) or share a working driver, I would be very grateful!