Microsoft Windows XP Professional x64 Edition

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Microsoft Windows XP Professional x64 Edition
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Microsoft Windows XP Professional x64 Edition released on April 25, 2005 by Microsoft is a variation of the typical 32-bit Windows XP operating system for x86 personal computers.
Windows XP Professional x64 Edition is based upon Windows Server 2003 SP1 (build 5.2.3790.1830), as that was the latest version of Microsoft Windows during the operating system's development, but takes Windows XP as its name. It is designed to use the expanded 64-bit memory address space provided by the AMD64 architecture; Intel refers to its implementation of the technology as EM64T.
The primary benefit of moving to 64-bit is the increase in the maximum allocatable system memory (RAM). Windows XP 32-bit is limited to a total of 4 GB, which is equally divided between Kernel and application usage. Windows XP x64 can support much more memory; although the theoretical memory limit a 64-bit computer can address is about 18 billion GB (18 exabytes), Windows XP x64 is currently limited to 128 GB (237 bytes) of physical memory and 16 TB (244 bytes) of virtual memory. Microsoft claims this limit will be increased as hardware capabilities improve. In practice, most motherboards compatible with 64-bit processors do not support nearly the maximum, and often retain the 4 GB limit.
The “x64 Edition” is not to be confused with the “64-bit Edition”, as the latter was designed for IA-64 (Intel Itanium) processors. They both are commonly referred to as '64-bit Windows' by Microsoft due to their similarities from the developers' point of view.
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