1. The processor (aka CPU or microprocessor) is the brain of your computer. It reads instructions from your software and tells your computer what to do. The speed at which the CPU processes information internally is measured in MegaHertz (MHz) and GigaHertz (GHz). 1 GHz is equal to 1,000 MHz. Generally, processors with higher MHz or GHz enhance your ability to run creative, entertainment, communication, and productivity applications.