Intel's new top-of-the-line Alder Lake CPU Core i9-12900K was able to achieve new single-core and multi-core benchmark world records after hitting extremely high clock speeds of up to 6.8 GHz with a liquid cooling solution.
https://www.notebookcheck.net/Alder-Lake-Overclocked-Intel-Core-i9-12900K-sets-new-benchmark-records-at-6-8-GHz.575802.0.html