Hello! I just purchased a GeForce GTX 1060 and to my disappointment it could not be used in my Mac Pro. So I went ahead and put my GeForce GTX 970 from my PC in my Mac Pro, and could not get it to work... in WINDOWS(!). It does work in OS X, however, but only at 3440x1440@30, which is a bit annoying. Could it be that I used HDMI? Since I primarily work in Windows on my Mac Pro at the moment, I'm wondering if you guys know why the card would work in OS X but not in Windows? I cannot install the Windows drivers without the card inside the computer, so there's quite a catch 22 going on here.