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64-bit refers to the number of bits (the smallest unit of information on a machine) that can be processed or transmitted in parallel, or the number of bits used for single element in a data format. When the term is used in conjunction with a microprocessor, it indicates the width of the registers #&151; a special high-speed storage area within the CPU. A 64-bit microprocessor can process data and memory addresses that are represented by 64 bits. The term is often applied to the following:

See also 32-bit and "What Is 64-bit Computing?" in Webopedia's Did You Know... section.

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