They both are commonly referred to as 64-bit Windows by Microsoft due to their similarities from the developers' point of view. The 圆4 Edition is not to be confused with the “64-bit Edition”, as the latter was designed for IA-64 (Intel Itanium) processors. Microsoft claims this limit will be increased as hardware capabilities improve. Windows XP 圆4 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 圆4 is currently limited to 128 GB ( 2 37 bytes) of virtual memory. Windows XP 32-bit is limited to a total of 4 GB, which is equally divided between Kernel and application usage. The primary benefit of moving to 64-bit is the increase in the maximum allocatable system memory (RAM). 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. 1830) as that was the latest version of Microsoft Windows during the operating system's development, but takes Windows XP as its name. Windows XP Professional 圆4 Edition is based upon Windows Server 2003 SP1 (build. Microsoft Windows XP Professional 圆4 Edition released on Apby Microsoft is a 64-bit edition of the typically 32-bit Windows XP operating system for x86-64 personal computers. Mainstream support ended on April 14, 2009
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