I recently installed gfxCardStatus on my rMBP to run some tests with Cinebench. (BTW I report nearly double the fps with the 750M vs. Iris Pro.) My question has to do with the use of such program. Is there a risk to force Iris Pro only and not let OSX do its 'dynamic switching' thing? I get a notification banner when it goes from iGPU > dGPU and vice versa so I know that my rMBP sometimes switches to dGPU when I watch youtube videos. Kind of an overkill if you ask me. I was then thinking about forcing Iris Pro and only use the dGPU when I need it. Could it potentially harm my system? Thanks for your help!