Well here at my home system the RX460 still doesn’t work at all, raytraced just doesn’t kick in, seems stuck at compiling.
So I might un- and reinstall rhino-beta here to check. wasn’t there something with kernel stuff in windows, maybe I have to change something again?
EDIT:
If you don’t have the time to deal with the cards - make AMD send them to me, I’d gladly be you guinea pig 
Also don’t wonder why there are so few AMD users here. You basically told everyone, that AMD is crap and has broken drivers. That’s why I bought the GTX1060 for the office.