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 ?
Imec utilized a common industry 64-bit CPU for the test chip with a custom 3nm standard cell library and a TRIM metal flow, where the routing pitch was reduced to 21nm.
Take UR75 as an example, features a 5-port Gigabit Ethernet switch and serial port for console access as well as 64-bit CPU for ramping up processing speed with low power consumption (<1W).
Cortina's CA7742 solution features a quad-core ARM Cortex-A53 64-bit CPU at up to 1.
This is a quad-core chip based on Qualcomm's custom Kryo 280 64-bit CPU core.
Thrill Of Performance: BLACK 1X is powered by an Octa-Core processor with 64-bit CPU architecture and integrated 4G LTE.
As well as its UHD streaming ability, there's a new faster 64-bit CPU and graphics processor that speeds up the already nippy interface, and the addition of Amazon's excellent supersmart Alexa voice assistant which is handily accessed via a microphone in the Wi-Fi enabled remote.
EasyPort is based on a 64-bit CPU core subsystem that uses the MIPS64 5Kc processor core from MIPS Technologies Inc, a provider of industry-standard processor architectures and cores.
In a typical 64-bit CPU motherboard where some 100 channels need to be properly terminated and interfaced with the backplane, only 10 SIG chips (CMCPCI-100) are required -- compared to 90 discrete components comprising 14 FET bus switches (16-bit) and 76 resistor packs (four-pack).
It features 64-bit CPU resolution and a [mu]-SC Circuit, which reduces electrode wear during finish machining.
Already proven in smartphones, the processor features dual image signal processors for up to 24MP images and 4K video at 30fps HEVC capture, octa-core 64-bit CPU, an integrated X9 LTE modem for peak speeds up to 300 Mbps download/100 Mbps upload, and support for Wi-Fi 802.
BLACK 3GB is powered by the 2nd gen Qualcomm Snapdragon 615 Octa-Core processor with 64-bit CPU architecture and integrated 4G LTE.
The company is now shipping the Raspberry Pi 3 computer, which at the same $35 price as its Pi 2 forerunner features a more powerful 64-bit CPU, and for the first time, comes with wireless capabilities.