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The clock rate of a CPU is typically determined by the frequency of an oscillator crystal. The first commercial PC, the Altair (by MITS), used an Intel 8080 CPU with a clock rate of 2 MHz. The artistic IBM PC (c. 1981) had a clock rate of 4.77 MHz (4,770,000 cycles/second). In 1995, Intel's Pentium chip run at 100 MHz (100 million cycles/second), and in 2002, an Intel Pentium 4 model be introduced as the first CPU with a clock rate of 3 GHz (three billion cycles/second).
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