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A 32 bit bus is a link that can transfer 32 bits at once, in parallel, while a 64 bit bus can transfer 64 bits at once. Any software (including the Operating System) written for 32 bits can be installed on both a 32 bit computer and a 64 bit computer (though it will be more performant on the latter) while a software written for 64 bits can only ... ................
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