64-bit computing

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64-bit computing

CPUs that process 64 bits as a single unit, compared to 8, 16 or 32. Today's fastest computers are 64-bit machines; however, they are not twice as fast as 32-bit computers, because the 64 bit "word size" relates to only one aspect of internal processing. The CPU's clock speed, along with the speed, size and architecture of the disks, memory and peripheral bus all play important roles in a computer's performance (see throughput). In many cases, the perceived difference can be negligible. See word.

More Memory
A major advantage to 64-bit operating systems is that they support more memory than a 32-bit OS, which is typically limited to 4GB. For example, while the 32-bit version of Windows 7 Professional handles 4GB, the 64-bit version supports up to 192GB. See PAE.

A Lot of 32-Bit Software
Although CPUs migrated to 64-bits years ago, the vast majority of people still run 32-bit operating systems and applications in their 64-bit personal computers.

New versions of Windows come in 32-bit and 64-bit versions, and Apple upgraded OS X for the Mac entirely to 64 bits in 2009 (see Snow Leopard). The complete migration from 32-bit applications to their 64-bit counterparts may take many years. For example, people still run 16-bit DOS and Windows applications in their PCs that were written more than two decades ago. This is why some users opt to install the 32-bit version of Windows, because 64-bit Windows does not run 16-bit apps natively (see Windows XP Mode). For examples of 64-bit hardware, see Intel 64, AMD64, Opteron and Athlon. See 32-bit computing and bit specifications.

References in periodicals archive ?
All components of the system shall be under windows 64-bit computer control and operate under windows 7 or higher computer operating system software.
com/2014/02/10/new-trojan-exploits-paul-walkers-death-snare-victims/) ITporta l stated security firm Symantec that, "Once the malicious file has been executed an error notification is sent indicating that a 32-bit or 64-bit computer is needed to run the file.
Modern 64-bit computer processors outperform the older processors found in keyboards.
3 with support for 64-bit computer platforms and expanded capabilities to seamlessly embed Open File Manger into virtually all OEM backup solutions.
Linux developers are beginning to adopt the 64-bit computer architecture.
It fully supports new 64-bit computer operating systems including Microsoft Windows NT and Linux, and can be used in high-performance PC servers and workstations as well.
25, in the New York Times, a new 64-bit computer chip that can process as many as 400 million instructions a second was announced by Digital Equipment Corp.
We at Z-CAD AS are delighted to hear that the new AutoPLANT V8i release will be compatible with 64-bit computer hardware and Windows," said Terje Olaussen, chairman, Z-CAD AS.
Both business and consumer versions will be available for 32-bit or 64-bit computer systems.
A 64-bit edition that allows users to take advantage of the expanded memory capacity of 64-bit computer systems to process huge datasets generated by the newest generation of non-contact 3D scanners.
Geomagic Studio 9 (64-bit edition) takes advantage of the expanded memory capacity of 64-bit computer systems to process huge datasets generated by the newest generation of non-contact 3D scanners.
In addition, he pointed out that MicroStation V8 XM will take advantage of all available memory even when running on a 64-bit computer with more than 4 gigabytes of memory; therefore, that is the optimal workstation for users who work on enormous designs.