Ok ive picked up an issue with this , its not major just majorly annoying for me.
When I updated my drivers (AMD June2018) I couldnt change out of recommended res setting being 3840. As much as I tried i could not change it, no matter what i did. It kept only giving me the top left of the screen for anything less than 3840x2160.
Strange thing is that when i went back to the Dec2016 release of this that I could change my res to 2560 full screen. Which is the one I prefer. Using the same drivers for both release's.