Overclocking can help you get more performance out of your current hardware, usually without spending anything. Although ...
Clock speed tells you how many computing cycles a device such as GPU to CPU is completing per second. Overclocking means increasing this clock speed above the maximum enforced by the manufacturer.
The practice of "overclocking," specifically in regards to PC components, means to deliberately push a component past its manufacturer-established limits to generate improved performance. In layman's ...