https://www.pcgamer.com/amds-second-gen-ryzen-cpus-are-topping-58ghz-when-overclocked/

Two of AMD's upcoming second-generation Ryzen processors have already been overclocked to 5.8GHz and beyond, a feat made even more impressive by the fact that all of the cores on each chip were enabled while it happened.

Extreme overclocker "TSAIK" achieved the feat on on AMD's Ryzen 7 2700X and Ryzen 5 2600X. Both had to be subjected to exotic cooling—liquid nitrogen, or LN2—in order to reach 5.8GHz and higher, so obviously running the new chips at that speed is not the least bit practical. We'll have to wait and see how they perform on air and traditional water cooling.