All microprocessors, or Central Processing Units (CPUs) operate at a very specific voltage. However, given the colossal assembly line at which these processors roll out, some processor models are tested at voltages higher than they really need. There is a process called Dynamic Voltage Scaling, a power management technique where voltages of individual components inside a computer can be increased/decreased. You save power when the CPU consumes less of it. This also leads to your system not heating up as much meaning the fans will no have to work as hard. Here’s how to undervolt a CPU
Disclaimer: This process is straight forward and considered safe, but if you end up configuring the wrong thing, you could damage your PC. So do this exclusively at your own risk.
Note: This is laptop exclusive because extending battery life is not a concern for desktops. Even though the core methodology works for both PC and Android mobile, we will cover only PC, as Android needs to be rooted for this process. Lastly, this process requires patience, because there is a lot of testing involved.