Okay, so specifically, I have an R9 390 and a GTX 750 Ti installed in my PC. I am unable to select the 750 Ti as the GPU for an application for a game to run on, as Windows for some reason things that the 275W R9 390 is more power efficient than the 35W 750 Ti. My question is, does anyone know where this dialog saves the information that I input? If it's simple, I might make my own program to set it and make it Open Source. Thanks for the help!