Yep, have try those, in fact it is same as Rx400 Win10.
I think there is some change in driver engine. When I use update driver in Device Manager,
10.8.3 Start with 16.xx.xxx.x (I am outside can't remember)
10.9.2 then go with 188.8.131.52
So, I start to think that there is some change in driver engine itself.