AMD64 was created as an alternative to Intel and Hewlett Packard’s radically different IA-64 architecture. Originally announced as “x86-64″ in August 2000,[3] the architecture was positioned by AMD from the beginning as an evolutionary way to add 64-bit computing capabilities to the existing x86 architecture, as opposed to Intel’s approach of creating an entirely new 64-bit architecture with IA-64.

The AMD64 instruction set is implemented in AMD’s Athlon 64, Athlon 64 FX, Athlon 64 X2, Phenom, Phenom II, Athlon X2, Turion 64, Turion 64 X2, Opteron and later Sempron processors. The primary defining characteristic of AMD64 is the availability of 64-bit general purpose registers, 64-bit integer arithmetic and logical operations, and 64-bit virtual addresses.

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