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  2. 64-bit computing - Wikipedia

    en.wikipedia.org/wiki/64-bit_computing

    A 64-bit processor performs best with 64-bit software. A 64-bit processor may have backward compatibility, allowing it to run 32-bit application software for the 32-bit version of its instruction set, and may also support running 32-bit operating systems for the 32-bit version of its instruction set.