I have two Graphics cards installed currently: my Nvidia Quadro fx 1800 and my Nvidia geforce gtx 760; however, it wont let me use my gtx 760 to play games, it uses the fx 1800 as default. for example, i play minecraft and skyrim, skyrim utilizes the gtx 760, but minecraft will not. how can i set minecraft to use the gtx 760 as well?