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Windows XP Professional 圆4 Edition uses the same kernel and code tree as Windows Server 2003 and is serviced by the same service packs. Although the theoretical memory limit of a 64-bit computer is about 16 exabytes (17.1 billion gigabytes), Windows XP 圆4 is limited to 128 GB of physical memory and 16 terabytes of virtual memory.
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32-bit editions of Windows XP are limited to a total of 4 gigabytes. The primary benefit of moving to 64-bit is the increase in the maximum allocatable random-access memory (RAM). It is designed to use the expanded 64-bit memory address space provided by the x86-64 architecture. Microsoft Windows XP Professional 圆4 Edition, released on April 25, 2005, is an edition of Windows XP for x86-64 personal computers.
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