Hi,
I have the same problem. R9 290x GPU. Got the BSOD with eror code 0xA0000001 and atikmdag.sys dxgmms1.sys and ntoskrnl.exe.
System only crashed when playing Flash games (Hearthstone Heroes of Warcraft), Youtube, Internet explorer, Flash websites. Never in games like BF4 or Watch_Dogs. I...