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Yes. In older systems, the clock crystal speed either provided the direct clock for the front side bus, and everything else ran on a divider, or was double the speed of the front side bus. Modern systems use a single fixed crystal at 14.318 MHz, and everything runs at either a multiple or divider of that clock. Some components, such as network cards may have their own crystal. Most add-on cards also have an oscillator crystal.

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14y ago
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15y ago

It is not a device. There is, however, a backup battery on the motherboard that can keep the clock running in lieu of an internet connection to sync to.

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9y ago

No.

A clock is a display.

It displays the course of time.

A computer computes, it makes calculations.

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Q: Does a computer have a clock crystal?
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The control signal is generated by the systems clock. The systems clock is called a crystal and runs at a constant speed. Typically measured in Mhz


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What is the purpose of a Crystal oscillator?

Crystal oscillators are made of a piezoelectric material that vibrates at a very precise frequency. A crystal oscillator in a digital circuit is used primarily for generating a clock signal. A clock signal is a square-wave signal that goes between a maximum and minimum voltage (usually between 5V and 0V or between 3.3V and 0V) at a precise frequency generated by the crystal oscillator. This clock signal is used for coordinating and/or controlling events in a digital circuit. In a digital watch, the current time is set and clock cycles are counted to measure the passage of time. As a second passes, the display is incremented to show that a second has passed. In a CPU, a program counter (which is used to keep track of which line of machine code the computer is at in a computer program) is incremented with each cycle of the clock. The faster the clock, the faster the program is executed. That is why CPU speed is measured in megahertz or gigahertz. There are other factors in program execution speed such as memory speed, read/write speeds, etc. but CPU clock speed is one of them.