Intel GMA 950 integrated graphics cannot work well on OS X 10.8. (Photo: Cnet).
Cnet has just given some reason why some Mac computers running OS X 10.7 Lion cannot upgrade to OS X 10.8 Mountain Lion. The source said Mountain Lion is a 64-bit operating system.
Although some Macs have 64-bit processors, the EFI firmware used to control the boot process is only recognized and works with 32-bit OS kernel. Therefore, systems that cannot run kernel and 64-bit extensions cannot be updated to Mountain Lion.
In addition, Intel GMA 950 integrated graphics on some Mac models are also 32-bit versions, so they cannot work well on OS X Mountain Lion operating system.
The complete list of Mac computers that can be updated OS X 10.8 includes: