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The 2 GB limit refers to a physical memory barrier for a process running on a 32-bit operating system, which can only use a maximum of 2 GB of memory. [1] The problem mainly affects 32-bit versions of operating systems like Microsoft Windows and Linux , although some variants of the latter can overcome this barrier. [ 2 ]
In computing on Microsoft platforms, WoW64 (Windows 32-bit on Windows 64-bit) is a subsystem of the Windows operating system capable of running 32-bit applications on 64-bit Windows. [1] It is included in all 64-bit versions of Windows, except in Windows Server Server Core where it is an optional component, and Windows Nano Server where it is ...
This is not an architectural limit; it is a limit imposed by Microsoft as a workaround for device driver compatibility issues that were discovered during testing. [ 18 ] Thus, the "3 GB barrier" under x86 Windows "client" operating systems can therefore arise in two slightly different scenarios.
However, "client" versions of 32-bit Windows (Windows XP SP2 and later, Windows Vista, Windows 7) limit physical address space to the first 4 GB for driver compatibility [16] even though these versions do run in PAE mode if NX support is enabled.
Microsoft releases Windows XP 64-Bit Edition for the Itanium's IA-64 architecture; it could run 32-bit applications through an execution layer. [citation needed] 2003 Apple releases its Mac OS X 10.3 "Panther" operating system which adds support for native 64-bit integer arithmetic on PowerPC 970 processors. [23]
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Details of GPT support on 64-bit editions of Microsoft Windows [31] OS version Release date Platform Read and write support Boot support Note Windows XP 64-Bit Edition for Itanium systems, Version 2002 2001-10-25 IA-64: Yes Yes MBR takes precedence in hybrid configuration. Windows XP 64-Bit Edition, Version 2003 2003-03-28 IA-64: Yes Yes
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