While both Zen 2 and the Zen 2 based Rome processor were officially announced by AMD at its Next Horizon event, little information was given on things like clock speed, IPC improvements, and other performance figures and specifications. At this year's Supercomputing conference, however, we got some details on Rome's clock speeds.
https://www.notebookcheck.net/Epyc-based-supercomputer-to-use-new-Rome-server-chip-clocked-at-2-35-GHz.361481.0.html