I suppose it's because AMD wants to force me to buy a new card. Well. I won't do it. After hours of trying every damn thing I finally got NMS working by installing driver version 15.300.1025.1001 from December 4, 2015. I couldn't get this driver from the AMD site because they've been cunningly hiding the older drivers, i.e. the drivers which actually work. You have to hunt for them elsewhere. How dare you people try to force me to throw a 2012 product in the landfill - shame on you! The 7900 still does a fantastic job with NMS. Maybe I'll upgrade in a year or two, but after experiencing AMD's so-called "support", your products will be at the bottom of my shopping list.