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Computer Microprocessor

A silicon chip that contains a CPU. In the world of personal computers, the terms microprocessor and CPU are used interchangeably. At the heart of all personal computers and most workstations sits a microprocessor. Microprocessors also control the logic of almost all digital devices, from clock radios to fuel-injection systemsfor automobiles.

Three basic characteristics differentiate microprocessors:

  • Instruction set: The set of instructions that the microprocessor can execute.
  • bandwidth: The number of bitsprocessed in a single instruction.
  • clock speed: Given in megahertz (MHz), the clock speed determines how many instructions per second the processor can execute.

In both cases, the higher the value, the more powerful the CPU. For example, a 32-bit microprocessor that runsat 50MHz is more powerful than a 16-bit microprocessor that runs at 25MHz.