Linked by moondevil on Wed 11th Jul 2012 22:49 UTC
Mac OS X Ars Technica is reporting that certain 64bit Mac models won't be able to run Mountain Lion. The problem is the graphic card drivers; these are still 32bit, and Apple is unwilling to update them to 64bit. A 64bit kernel can't load 32bit drivers, so that's that. Apple has a list of supported models on their Mountain Lion upgrade page, so you can easily check if your computer is capable of running Mountain Lion.
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RE[2]: Comment by bloodline
by Morgan on Fri 13th Jul 2012 03:10 UTC in reply to "RE: Comment by bloodline"
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I think he means OS support is generally for three years. Apple's major OS releases from Tiger on up have been right around 18 months apart (until ML), with full support for the current and last releases only. So, 18 months * 2 = 3 years.

Of course he could also be referring to three-year AppleCare warranties, which would actually make for four years of support (first year plus the three from AC).

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