64-bit computing

(redirected from 64-bit processing)

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 ?
This architecture support enables the Nucleus RTOS to leverage the benefits of 64-bit processing for a full range of 64-bit SoCs.
This happened with the iPhone 5s, and it took Android smartphone makers some time to catch up with Apple, as far as 64-bit processing was concerned.
Taking advantage of 64-bit processing and large addressable memory space, the performance gain is nearly 15% over previous versions.
While Exynos processors are not below the quality of Snapdragon counterparts, it is still better to have a device with eight cores sporting 64-bit processing support.
It has twice the CPU and graphic performance of the fourth-gen iPad, and the Air boasts 64-bit processing like the recently launched iPhone5S.
With an inviting interface for users of all levels, PhotoDirector 5 uses the power of 64-bit processing and uniquely integrates the three major tasks related to digital photos: editing, collection management and high-quality adjustments.
The current ARM processors lack many of the critical features sought in data centres today, such as 64-bit processing and memory capabilities.
MIPS Technologies has a long history in 64-bit processing.
Don't bother upgrading an XP PC that is more than three years old; its outdated hardware can't take full advantage of Windows 7's capabilities, such as 64-bit processing and XP Mode's hardware virtualization.
Additionally, it specs out at 533MHz FSB, 64-bit processing with a peak TDP of only 8W.
Also, 64-bit processing support was added to exploit the latest in computer hardware, and built-in database management simplifies IT administration.
Upgrades to the package include 64-bit processing support, better distributed processing of simulations than past versions, improved support for exploiting periodicity in designs, and an optimization tool that applies multiple algorithms to resolve complex problems.