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[3]: No biggie
by Neolander on Thu 12th Jul 2012 13:13 UTC in reply to "RE[2]: No biggie"
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Well, it can be considered a secret, since what Apple calls "EFI" only remotely complies with the EFI and UEFI specs and keeps doing weird undocumented stuff (such as overwriting kernels after boot) all the time.

Here are some examples :

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