Hey guys, I see so many people on this forum that keep wondering why their 15" MBP only seems to have the Intel HD 4000 graphic chip. So once and for all, your MBP automatically switches depending on what you are doing. By default it will use the Intel HD 4000 as it saves power and therefore generates less heat too. If you want to manually switch GPU, download gfxCardStatus. That way you'll be able to use either one when you want.