Intel summed up the "speed" [sic] difference between a 4004 and a Pentium 4 with an interesting assume-this-basketball-represents-the-sun-like analogy: "Intel's first microprocessor, the 4004, ran at 108 kilohertz (108,000 hertz), compared to the Pentium® 4 processor's initial speed of 1.5 gigahertz (1.5 billion hertz). If automobile speed had increased similarly over the same period, you could now drive from San Francisco to New York in about 13 seconds."
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Intel summed up the "speed" [sic] difference between a 4004 and a Pentium 4 with an interesting assume-this-basketball-represents-the-sun-like analogy: "Intel's first microprocessor, the 4004, ran at 108 kilohertz (108,000 hertz), compared to the Pentium® 4 processor's initial speed of 1.5 gigahertz (1.5 billion hertz). If automobile speed had increased similarly over the same period, you could now drive from San Francisco to New York in about 13 seconds."