With Apple pushing out the golden master build of OS X Mountain Lion to developers, Apple has made official which machines will be making the cutoff. These requirements have been known for some time, but are now seemingly etched in stone.Your Mac must be one of the following models:
Your Mac must be one of the following models:
- iMac (Mid 2007 or newer)
- MacBook (Late 2008 Aluminum, or Early 2009 or newer)
- MacBook Pro (Mid/Late 2007 or newer)
- MacBook Air (Late 2008 or newer)
- Mac mini (Early 2009 or newer)
- Mac Pro (Early 2008 or newer)
- Xserve (Early 2009)
Ars Technica has a generated a hypothesis as to why these cutoffs exists. Long story short, it boils down to graphics and drivers. Here’s an except:
Our own Andrew Cunningham suspected the issue was related to graphics drivers, since the GPUs not supported under Mountain Lion had drivers that were written before 64-bit support was common.
In other words, Apple has decided that upgrading the 32-bit KEXTs that are keeping the fully 64-bit Mountain Lion off of GPUs in older Macs. But, I suppose when you’re experiencing explosive growth like the Mac is, you can afford to cut some of the older machines out of the update cycle.