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: Not graphic card drivers
by toast88 on Sat 14th Jul 2012 22:35 UTC in reply to "Not graphic card drivers"
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So these no longer supported machines are the same machines that couldn't boot Snow Leopard or Lion in 64-bit mode.(I remember managing to do this on my unsupported iMac though. Had to use Boot Camp and the chameleon boot loader from OSx86)

Except that MacOS Lion 10.7 boots in 64 bit mode by default unless you press and hold <3> and <2> on the keyboard when powering on the machine.


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