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10.6: How to boot into the 64-bit kernel
Authored by: DEMON on Sep 15, '09 08:29:14AM

Not all macs with a 64bit EFI can boot in the 64 bit kernel mode, because the DIMM (memory) is still 32 bit.

Only if all the hardware is 64 bit your mac will be fully 64 bit capable.



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10.6: How to boot into the 64-bit kernel
Authored by: outZider on Sep 15, '09 10:40:08AM

Uh, no. This has everything to do with firmware and drivers. If you have a 64 bit capable processor, you're theoretically fine as soon as Apple supports you. 64 bit matters in how you address the memory, not what the memory "is".

This is exactly why you can install 64 bit Windows, 64 bit Linux, 64 bit FreeBSD, and 64 bit Solaris on any other 64 bit capable Intel processor, and even those Macs that don't have 64 bit OS X support yet.



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