The brain of the PC is the processor or Central Processing Unit (CPU).The CPU performs the system's calculating and processing,except for special math-intensive processing in systems that have a math coprocessing unit chip.One of the most common ways to describe a processor is by the size of the processor's data bus and address bus.The processor bus discussed most often is the data bus--used to send and receive data.
| Pentium 1 | 100,133,166-MHz |
| Pentium 2 | 200,266,300-MHZ |
| Pentium 3 | 400,450,466-MHz |
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