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Just use Windows Performance Monitor. (Start -> Run, "perfmon" or just Windows key + perfmon). Setup the counters at the interval you want, and away you go.
The "Instance of selected object" for the Processor counters are the cores. If you select <all instances>, I believe it's a sum of the cores. But you can select all of the individual ones instead and add those to get that granular if you wantAm I missing where to see per-core information? Frequency per-core specifically.