https://www.techradar.com/news/amds-ryzen-threadripper-2990wx-hits-6ghz-overclocked-across-all-32-cores

AMD has unleashed its Ryzen Threadripper 2990WX onto the world, and in the hands of one intrepid overclocker this mighty processor has been pushed to a new record with a boost to a hair’s breadth away from 6GHz across all of its 32-cores.

As expected, this was using liquid nitrogen cooling, and was achieved by an Indonesian overclocker, Ivan Cupa, who clocked the Ryzen CPU up to 5.955GHz; and again it’s worth repeating that this feat was achieved across every core (he used an MSI MEG X399 Creation motherboard, incidentally).