• Directory of Internet terms
  • Clock speed — The speed of a computer's Central Processing Unit (CPU), which is normally expressed in MegaHertz (= one million cycles per second) or GigaHertz, (= 1000 MegaHertz). This figure represents the number of instruction cycles the processor carries out each second. In simple terms this indicates how fast the computer runs - how powerful it is. Computers that run at 500 MegaHertz (500MHz) used to be considered fast, but modern computers now run at over one GigaHertz (1GHz). See Hertz, Microprocessor.