Until 14.11.2 beta, I used the AMD classic drivers but the card is recognized as a HD7000 series. That's not what I call "official" or "well-fitted". And so, why the bootcamp drivers are not updated since the release of the machine?
In addition to that, I don't know for your hardware, but when I use my computer for gaming (in Battlefield 4 especially), I have regular framerate drops from 60 to 28-34 even when I stay without any move. I find it really weird...
What machine do you have?