First and foremost, whenever I upgrade to the latest drivers they will always bug out and say that I'm missing a driver ini or something.
So I did a driver sweep and clean installed the 10.12 drivers.
Now that I have them, I am having slow starting up issues with games. Like for example, it will take ten seconds or so for the game to finally coming up after starting it in windows. But after that, games run perfect.
i7 930 @ 3.8ghz
I had pretty much the same issue and rolled back to an older driver(10.10e).
However,before rolling back to an older driver,you may want to check this topic first http://forums.guru3d.com/showthread.php?t=336844
It seems disabling ATI AVIVO helps.