Hey everyone! TLDR: GTX 970 works on OSX but not on Windows 8 I recently upgraded from my 2008 cMP to a 2009 with a 3.33 Hex. It had a gt 120 in it and since I have an unflashed GTX 970 I left that card in and installed the GTX 970 along with it (installed in the first double wide slot). In addition I also have a 4 port USB 3.0 card and the Velocity Duo. My boot drives are on the velocity (osx on one ssd and windows 8 on the other) I have two monitors, a 34" uw LG plugged in via display port to the GTX 970 and a older 22" on the gt 120. GT 120 shows the boot screen on OSX, once it loads the GTX 970 is seen (I have the most recent nvidia drivers) without issue. When I boot into Windows 8 the GT120 works but the 970 does not. The device manager says that the GTX 970 isn't working properly and so windows stopped it. Should I have different drivers than the normal Nvidia ones installed? Do you think the gt120 is creating a conflict? I tried searching but can't find any threads to this effect although I thought I remembered something about the 120 creating problems. Thanks for any help you can give!