Just put Windows on it in a BC partition. I don't game but I do run X-Plane, the most demanding OpenGL sim app out there and the 15"rMBP will run it fine under Win 8 with a few sacrifices, but not unacceptable ones. Under OS X, forget it. If your app is OpenGL, the Nvidia drivers are FAR better in Windows. Does it compare to my 4790K/GTX 980 PC? LOL, not by a long shot, but it performs as well as my new Mac Pro for this sort of app. Actually, at some settings, the 750m is beating the hex with dual D500 in frame rates. YMMV.