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A machine running Windows XP Professional x64 Edition cannot be directly upgraded to Windows Vista because the 64-bit Vista DVD mistakenly recognizes XP x64 as a 32-bit system. Windows XP x64 does qualify the customer to use an upgrade copy of Windows Vista or Windows 7, however it must be installed as a clean install.
The maximum amount of RAM that Windows XP can support varies depending on the product edition and the processor architecture. All 32-bit editions of XP support up to 4 GB, except the Windows XP Starter edition, which supports up to 512 MB of RAM. [103] The 64-bit editions support up to 128 GB. [104]
Windows XP x64 can support much more memory; although the theoretical memory limit a 64-bit computer can address is about 16 exabytes, Windows XP x64 is limited to 128 GB of physical memory and 8 terabytes of virtual memory per process while the practical limit is usually the size of the pagefile.
If you want to upgrade a system from Windows 10 32-bit to the 64-bit version, you first need to determine whether the processor has 64-bit support, 2GB of memory, or more, and whether the ...
Windows XP: Whistler: October 25, 2001 NT 5.1 Windows XP Starter; Windows XP Home; Windows XP Professional; 2600 IA-32: April 8, 2014 Windows XP 64-bit Edition; Itanium: Freestyle: October 29, 2002 Windows XP Media Center Edition; IA-32: Harmony: September 30, 2003 Windows XP Media Center Edition 2004; Symphony: October 12, 2004 Windows XP ...
The original releases of Windows XP and Windows XP SP1 used PAE mode to allow RAM to extend beyond the 4 GB address limit. However, it led to compatibility problems with 3rd party drivers which led Microsoft to remove this capability in Windows XP Service Pack 2.