Since there are several new graphic intensive features introduced in Mountain Lion, Apple has officially added a number of older Macs to the list of obsolete computers that will not be able to update to the latest OS X edition when it is publicly released this summer. Among the older Macs that won’t be able to make the update are any machines prior to mid-2007 iMacs, early-2008 Mac Pros, early-2009 Mac minis and early-2009 Xserve units. Is your Mac obsolete?
“Any Mac sporting Intel’s sluggish GMA x3100 or 950 chip won’t be able to run Mountain Lion. While we’ve gone a long way since the GMA graphics, you probably have somewhere under your table or in the basement a legacy Mac which doesn’t have enough oomph for Mountain Lion.”