Originally Posted by kaseki
This reminds me of a question that has been hanging in my attention background: Why does progressively higher leakage (1700 --> 1800X) correlate with progressively higher maximum clock frequency?
Because these chips have already been pushed so far at stock, that we're already hitting the voltage limits (rather than the usual thermal or clock limits). Silicon with higher SIDD generally requires less voltage at ISO frequency and has at least somewhat better voltage scaling. They draw more current and run hotter than the silicon with lower leakage, but in case the silicon isn't thermally limited that's not a disadvantage but an advantage.
There is a reason why they are binned this way at the factory as well
Same was done with Vishera 9k-series CPUs. Using high leakage silicon is most likely the only way to produce 1800X models with their 4.1GHz MSCXFC, without breaching the reliability thresholds for VDDCR_CPU.