A user on the ChipHell forums posted what appear to be base and boost clocks for the purported Ryzen 9 3900XT, Ryzen 7 3800XT, and Ryzen 5 3600XT. The CPU, which clock up to 4.8 GHz seem to be a short-term counter to Comet Lake S while AMD preps Ryzen 4000.
https://www.notebookcheck.net/Rumored-clockspeeds-leak-for-4-8-GHz-AMD-Ryzen-9-3900XT-4-7-GHz-Ryzen-7-3700XT-and-Ryzen-5-3600XT-Upclocked-Matisse-refresh-takes-on-Comet-Lake-S-i7-10700K-and-i9-10900K.466481.0.html