The definition of megahertz

(related variations: MHz megahertz)
One megahertz is equivalent to 1000 kilohertz, or 1,000,000 hertz. The clock speed of the main processor of many computers is measured in MHz, and is sometimes (quite misleadingly) used to represent the overall speed of a computer. In fact, a computer's speed is based upon many factors, and since MHz only reveals how many clock cycles the main processor has per second (saying nothing about how much is actually accomplished per cycle), it can really only accurately be used to gauge two computers with the same generation and family of processor plus similar configurations of memory, co-processors, and other peripheral hardware.