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The early Pentium 4 made use of a feature called the 'instruction trace cache' and the clock rate of the earliest model was 1.3 GHz. The fastest model was the Pentium 4 670, with a clock rate of 3.8 GHz. Intel later redesigned the processor based on the 'Core' architecture, which can achieve the same performance at a lower clock rate. The second generation of the Core architecture, called the Core-2 architecture, first started with a clock rate of 1.8 GHz and its performance far exceeded the Pentium 4 670 at 3.8 GHz. This is a classic example that demonstrates how other architectural features can determine the performance of a processor, and of an overall computer system.
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