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]: Not graphic card drivers
by cm49 on Thu 12th Jul 2012 21:08 UTC in reply to "RE: Not graphic card drivers"
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I'm aware of the difference. But it seems like an artificial limitation - the hardware is clearly capable of running 64-bit operating systems.
It may be because of the interaction between OS X and EFI after boot, for choosing start disk etc.

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