I plan to try the 4.15 rc. But then I don't know for what all I need on top of that. Phoronix has some articles on the topic, but they don't provide much specifics.
I did try their proprietary drivers, too, but did not have any luck. Maybe I'll have time to tinker with it tomorrow. It would have been nice to have out of the box support :) I suppose they will get there eventually.