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 ?
This is the industry's first voice engine that enables to run a VoIP application on devices with CPU clock rate of 200 MHz or less, for example, Qtek 8310, iPAQ 6340, and the like.
Armed with this new processor, the HW400c/M and HW400p/M will allow integrators to realize an increased CPU clock rate of up to 300 MHz, and superior memory bandwidth -- up to 1GB per second.
FSMLabs RTLinuxPro and RTCoreBSD let developers meet requirements for low-latency hard real-time responsiveness without sensitivity to application load for a wide range of CPU clock rates.
FSMLabs RTLinuxPro and RTCoreBSD let developers meet requirements for low-latency hard-real-time responsiveness without sensitivity to application load for a wide range of CPU clock rates.
FSMLabs' RTLinuxPro and RTCoreBSD meet requirements for low-latency hard real-time responsiveness without sensitivity to application load for a wide range of CPU clock rates.