Windows XP Professional x64 Edition
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| Developer | Microsoft |
|---|---|
| OS family | Windows NT |
| Source model | Closed source, shared source |
| Initial release | April 25, 2005 |
| Latest release | Service Pack 2 (5.2.3790.3959) / March 13, 2007 |
| Kernel type | Hybrid kernel |
| Default user interface | Graphical user interface |
| License | Proprietary commercial software |
| Official website | windows |
| Support status | |
| Mainstream support ended on April 14, 2009. Extended support ended on April 8, 2014. |
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Microsoft Windows XP Professional x64 Edition released on April 25, 2005 is an edition of Windows XP for x86-64 personal computers. It is designed to use the expanded 64-bit memory address space provided by the x86-64 architecture.
The primary benefit of moving to 64-bit is the increase in the maximum allocatable random access memory (RAM). Windows XP 32-bit is limited to a total of 4 gigabytes. Although the theoretical memory limit of a 64-bit computer is about 16 exabytes (17.1 billion gigabytes), Windows XP x64 is limited to 128 GB of physical memory and 16 terabytes of virtual memory.
Windows XP Professional x64 Edition uses the same kernel and code tree as Windows Server 2003 and is serviced by the same service pack. However, it includes client features of Windows XP such as System Restore, Windows Messenger, Fast User Switching, Welcome Screen, Security Center and games, which Windows Server 2003 does not have.
Windows XP Professional x64 Edition is not to be confused with Windows XP 64-bit Edition, as the latter was designed for Itanium architecture. During the initial development phases, Windows XP Professional x64 Edition was named Windows XP 64-Bit Edition for 64-Bit Extended Systems.
Windows XP Professional x64 Edition uses a technology named Windows-on-Windows 64-bit (WoW64), which permits the execution of 32-bit software. It was first used in Windows XP 64-bit Edition (for Itanium architecture). Later, it was adopted for x64 editions of Windows XP and Windows Server 2003.
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