Recently I normalized my single core CPU. It offers a series of benchmarks on a single core with HT / off Turbo, for sixteen CPU from the Pentium 4 to 2600K, running at 3GHz. This is not a judgment of actual performance benchmarks, as we all know that the additional cores, Turbo, and Hyper-Threading absolutely make a difference at this point. But it gives a great perspective on how a single-core performance has changed since 2005, helping to contrast dissimilar classes based processor in a clock-for-clock (i.e. several dual-core, multi-core four).
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