Aporte original por: Jurek Raben ,
The graphics device is a standard mxm ii/iii board that can be removed and is NOT soldered on to the mainboard. theoretically it is exchangable. Some people argue that other gfx boards wont work because Apple needs to modify the bios/efi then. I dont think so, because a plenty of gfx devices that are not sold by apple run on osx by using enbler software.