why is 64 bits version called AMD64 and 32 bits version called i386?

The 64-bit version is typically called ‘amd64’ because AMD developed the 64-bit instruction extensions. (AMD extended the x86 architecture to 64 bits while Intel was working on Itanium, but Intel later adopted those same instructions.)

The 32-bit version is called i386, because Intel originated the 32-bit instruction set used on these chips.

You can run the 64-bit version on virtually any 64-bit capable x86 compatible chip, and the 32-bit version on any modern x86-compatible chip.

Source: http://superuser.com/questions/128496/why-is-64-bits-version-called-amd64-and-32-bits-version-called-i386

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