I am having this exact same issue. It never gets passed the windows 7 loading screen.
I have also tried windows 10 both with fresh new installations. I also tried different chipsets and still having the same issue. AMD has no idea how to resolve it.
I checked the boot files and it seems like its failing on the wx9100 driver load. W9100 cards dont present a problem. If I swap the card with a w9100, I have no issues and windows boots fine.
Does anyone happen to know the registry key " WmAudioRegFix off " changes? I am willing to try anything at this point.