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64-bit computing

   Also found in: Wikipedia, Hutchinson 0.14 sec.

64-bit computing

Refers to CPUs that use 64-bit words. Examples are Sun's UltraSPARC series, the G5 processors in the Macintosh and Intel's Itanium family.

In the x86 PC world, AMD was the first to move to 64-bit CPUs with its 2003 introductions of the AMD64 Opteron and Athlon chips. Microsoft added support in Windows XP for AMD's 64-bit instructions (AMD64). Although Intel featured 64 bits in its Itanium line, in response to AMD, it introduced 64-bit x86-based Xeon CPUs in 2004. The 64 bit CPUs were first called "Extended Memory 64 Technology" (EM64T), but later changed to "Intel 64." Intel 64 chips incorporate AMD's 64-bit instructions. See bit specifications, Intel 64, Opteron, Athlon, UltraSPARC and G5.



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"The AMD Opteron processor offers high-performance 32- and 64-bit computing, enabling more users to easily move their applications forward to parallel 64-bit computing," said Matt Oberdorfer, president and CEO, Engineered Intelligence.
EI announces MPI-XF support for AMD Opteron processors by EDP Weekly's IT Monitor
The AMD Opteron processor provides SQL Server 2005 Beta 2 testers with the investment protection of outstanding overall x86 performance in both 32-bit and 64-bit computing environments.
AMD64 PROVIDES SMOOTH MIGRATION PATH by Online Product News
With the ability to easily migrate applications to AMD64, AMD Opteron processors provide such a simplified path to 64-bit computing that we continue to see a groundswell of support.
AMD announces IBM and Oracle support to further boost enterprise ... by EDP Weekly's IT Monitor
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