Overclocking is the action of increasing a component’s clock rate, running it at a higher speed than it was designed to run. This is usually applies to the CPU (Central Processing Unit) or GPU (Graphics Processing Unit), but other components can also be overclocked.
Increasing a component’s clock rate causes it to perform more operations per second, but it also produces additional heat. Overclocking can help squeeze more performance out of your components, but they’ll often need additional cooling and care. (HowToGeek.com)
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