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In 2003, AMD introduced the and Athlon 64 processors, extending the x86 instruction set to 64 bits while retaining backward compatibility with 32-bit applications (x86-64). Intel later adopted this under the name EM64T .

1. Overview Windows XP Professional x64 Edition was released by Microsoft in April 2005 (generally available by late April). Unlike the standard 32-bit version of Windows XP, this edition was designed to run on 64-bit extended systems —specifically, processors based on the x86-64 architecture (AMD64 and later Intel EM64T). windows xp professional 64

It was not a successor to Windows XP Professional (32-bit), but rather a specialized offshoot aimed at technical workstations, power users, and early adopters of 64-bit computing. In the early 2000s, 64-bit computing was largely confined to Intel’s Itanium architecture, which ran Windows XP 64-Bit Edition for Itanium (a different, incompatible codebase). However, Itanium failed to gain traction in desktop or general-purpose workstation markets. In 2003, AMD introduced the and Athlon 64