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64-bit
(redirected from 64 bits)

    Also found in: Wikipedia, Hutchinson 0.03 sec.

64-bit

See bit specifications.

(architecture)64-bit - A term describing a computer architecture based around an ALU, registers and data bus which are 64 bits wide.

64-bit processors were quite common in 1996, e.g. Digital Alpha, versions of Sun SPARC, MIPS, IBM AS/4000. the PowerPC and Intel were expected to move to 64 bits at their next generation - PPC 620 and Intel P7.

A 64-bit address bus allows the processor to address 18 million gigabytes as opposed to the mere 4 gigabytes allowed with 32 bits. There were in 1996 already hard disks which can hold over 4GB. Floating point calculations can also be more accurate.

A 64-bit OS is needed as well to take advantage of the CPU. In 1996 there were only a few 64-bit operating systems, including OS/400, Digital Unix, Solaris (partialy). A 32-bit OS can run on a 64-bit CPU.


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We were the first to bring 64 bits and dynamic power management to notebooks, and now the performance of AMD mobile processors is available at your fingertips in a dynamic convertible tablet PC.
AMD rewrites the rules for notebook performance by EDP Weekly's IT Monitor
A 64 bit quantity (representing 64 bits of the original 128 bits of entropy) that is derived from the original key controls the selection of the cryptosystem.
Report on the Development of the Advanced Encryption Standard (AES) by Roback, Edward / Journal of Research of the National Institute of Standards and Technology
The move to 64 bits would again double the speed potential.
What you really need by Zarowin, Stanley / Journal of Accountancy
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