clock rate


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clock rate

[′kläk ‚rāt]
(electronics)

Clock Rate

 

the change in clock correction per unit time. Different types of clock rates, such as diurnal and hourly, are distinguished, depending on the unit of time selected. With a negative clock rate, the clock runs fast; with a positive rate, it falls progressively behind true time. The magnitude of the clock rate depends on the adjustment of the clock but is not a reflection of the clock’s quality. It is affected by various factors related to the design of the clock mechanism and to external conditions of its operation. Therefore, whenever the precise time is required, as for example in astronomy, several clocks are used, and their rates are carefully studied by daily comparisons of their readings.

clock rate

(processor, benchmark)
The fundamental rate in cycles per second at which a computer performs its most basic operations such as adding two numbers or transfering a value from one register to another.

The clock rate of a computer is normally determined by the frequency of a crystal. The original IBM PC, circa 1981, had a clock rate of 4.77 MHz (almost five million cycles/second). As of 1995, Intel's Pentium chip runs at 100 MHz (100 million cycles/second). The clock rate of a computer is only useful for providing comparisons between computer chips in the same processor family. An IBM PC with an Intel 486 CPU running at 50 MHz will be about twice as fast as one with the same CPU, memory and display running at 25 MHz. However, there are many other factors to consider when comparing different computers. Clock rate should not be used when comparing different computers or different processor families. Rather, some benchmark should be used. Clock rate can be very misleading, since the amount of work different computer chips can do in one cycle varies. For example, RISC CPUs tend to have simpler instructions than CISC CPUs (but higher clock rates) and pipelined processors execute more than one instruction per cycle.
References in periodicals archive ?
The TC35273XB offers video at 15 frames per second in a 176 x 144 pixel video display, along with support for multiple audio CODECs including Adaptive Multi Rate (AMR) speech at a clock rate of 70MHz.
Thus, independent of the clock rate, 32-bit systems operate inherently faster since they are capable of moving twice the amount of data.
Prior to the updated Dual-Mode Standard release, Dual-Mode cable adaptors were limited to a TMDS clock rate of 165MHz providing support for display resolutions up to 1080p with 60Hz and 24 bits color.
This clock rate is 50 times faster than circuits inside desktop computers and is faster than any previously reported process technology.
Right now, it's not much faster than a 486 with a comparable clock rate.
Trans Intl 1GB DDR Memory Modules operate at a clock rate of 133MHz and transmits data at 266 Mbps.
The ADC is especially suited for nomadic applications and is scalable in clock rate and towards the 45nm CMOS technology node and below.
The RM7000C delivers a maximum production clock rate of 600 MHz and is also available at a rate of 533 MHz.
Designed at an optimum 40 MHz pixel clock rate, the DT3162 provides a much faster sample rate allowing for more precise image capture across a broad range of cameras.
In a traditional base station transmitter, the digital-to-analog converters (DACs), such as ADI's AD9779, will have a higher clock rate, which is divided down to match the ADC.
Additional features include a clock rate of 400 KHz, an operating voltage of 1.