The Speed Limit
Megahertz and gigahertz are analogous to a highway speed limit. The higher the speed, the faster the traffic moves. In a CPU, the higher the clock rate, the quicker data gets processed. The 8-, 16- and 32 bit designation is the CPU's word size and can be thought of as the number of lanes on the highway. The more lanes, the more traffic. The combination of speed and number of paths determines the total processing speed or channel bandwidth.
Learn more about MHz