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System clock rate = rate of an electronic pulse used to synchronize processing

(Only one action can take place between pulses.)

Measured in megahertz (MHz) where 1 MHz = 1 million cycles per second or gigahertz (GHz) where 1 GHz = 1 billion cycles per second.

This is what they are talking about if they say a computer is a 2.4 GHz machine. It's clock rate is 2.4 billion cycles per second.

Bigger number = faster processing

so, the faster the system clock is the more instructions you can perform

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Q: How does system clock influence the number of instructions?
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