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2. Physical Address Extension - Wikipedia

   en.wikipedia.org/wiki/Physical_Address_Extension

   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. [23]

3. List of Mac models grouped by CPU type - Wikipedia

   en.wikipedia.org/wiki/List_of_Mac_models_grouped...

   The PowerPC 970 ("G5") was the first 64-bit Mac processor. The PowerPC 970MP was the first dual-core Mac processor and the first to be found in a quad-core configuration. It was also the first Mac processor with partitioning and virtualization capabilities. Apple only used three variants of the G5, and soon moved entirely onto Intel architecture.

4. Classic Mac OS memory management - Wikipedia

   en.wikipedia.org/wiki/Classic_Mac_OS_memory...

   The problem was that the decision to use 24-bit or 32-bit addressing has to be made very early in the boot process, when the ROM routines initialized the Memory Manager to set up a basic Mac environment where NuBus ROMs and disk drivers are loaded and executed.

5. 64-bit computing - Wikipedia

   en.wikipedia.org/wiki/64-bit_computing

   The term 64-bit also describes a generation of computers in which 64-bit processors are the norm. 64 bits is a word size that defines certain classes of computer architecture, buses, memory, and CPUs and, by extension, the software that runs on them. 64-bit CPUs have been used in supercomputers since the 1970s (Cray-1, 1975) and in reduced ...

6. Mac OS X Snow Leopard - Wikipedia

   en.wikipedia.org/wiki/Mac_OS_X_Snow_Leopard

   In addition, the Mac OS X kernel has been rebuilt to run in 64-bit mode on some machines. On those machines, Snow Leopard supports up to 16 terabytes of RAM. Newer Xserve and Mac Pro machines will run a 64-bit kernel by default; newer iMac and MacBook Pro machines can run a 64-bit kernel, but will not do so by default. [44]

7. Boot Camp (software) - Wikipedia

   en.wikipedia.org/wiki/Boot_Camp_(software)

   Support for Windows 8.1 and Windows 8.1 Pro (64-bit only) 5.1.2 October 16, 2014 6.0 August 13, 2015 Support for Windows 10 (64-bit only) 6.1 September 20, 2016 Only accept new installations of Windows 7, Windows 8.1 and Windows 10 (64-bit only) 6.1.13 October 26, 2020 Improves audio recording quality when using the built-in microphone