Overclocking is the process of increasing the clock rate of a processor to enhance hardware performance within a certain range. In crypto mining, some miners overclock their rigs to increase their hashrate and potentially mine more coins. Underclocking, on the other hand, is a way to decrease the clock rate to reduce performance and power consumption while still mining economically.
For ASIC miners, overclocking can be achieved by applying a specific version of the firmware. For GPUs, software is available for setting a combination of metrics such as core voltage, power limit, and temperature limit.
It is important to follow professional guidelines and conduct sufficient research before modifying the clock rate. However, it is not recommended to modify the clock rate, as it can lead to risks of hardware damage, abnormal hashrate, and reduced mining rewards.