InQuest has published a study of the Pentium IV. It found that because of the P4's cache design, it uses 4 times the memory bandwith a PIII does on random access data benchmarks. Even on benchmarks which benefit from the larger cache-line size, the P4 shows no benefit due to its higher clock rate. Furthermore, the 1.5GHz P4's thermal diode throttles the part to effectively 750Mhz as soon as power consumption exceeds 54.7W. Without this limitation, a P4's maximum consumption would be 72.9 watts, similar to a 1.33 GHz Athlon's 73 watts.
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