What's keeping Mountain Lion off of some 64-bit Macs? Ars investigates

ARS Technica: The system requirements for the OS X 10.8 (Mountain Lion) developer preview released last week indicated that quite a few "modern," 64-bit capable Macs would not be able to upgrade to the new OS. How Apple determined the cutoff still remains fuzzy, but according to our research, we believe the issue is related to the graphics capabilities of those machines. Apple has suggested to Ars that the list is not set in stone, however, so some of the earlier Core 2 Duo Macs may end up making the final cut after all.

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