Not sure if there are true heterogeneous server CPUs or not, but with Intel Speed Select Technology (SST) you can mimic some similar features. SST allows you to set some cores to be higher base frequency, turbo frequency, etc, in return for other cores having corresponding lower frequencies. Naturally, the cores are not inherently different here, it's just distributing the power/thermal loads differently, so it's not a true heterogeneous system.
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