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Physical Address Extension
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=== macOS === [[Mac OS X Tiger]] through [[Mac OS X Snow Leopard]] support PAE and the [[NX bit]] on IA-32 processors; Snow Leopard was the last version to support IA-32 processors. On x86-64 processors, all versions of [[macOS]] use 4-level paging (IA-32e paging rather than PAE) to address memory above 4GB. [[Mac Pro]] and [[Xserve]] systems can use up to 64 GB of RAM.<ref>{{cite web | title = Road to Mac OS X 10.6 Snow Leopard: 64-Bits | date = 2008-09-26 | url = http://www.appleinsider.com/articles/08/08/26/road_to_mac_os_x_10_6_snow_leopard_64_bits.html | access-date = 2008-09-26}}</ref>
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