According to a WCCFTech report, MSI will soon be releasing a BIOS update for select X570 motherboards, enabling BCLK overclocking. This would allow power users to push clocks on the Ryzen 7 5800X3D, albeit at the cost of systemwide stability.
https://www.notebookcheck.net/MSI-set-to-enable-base-clock-overclocking-on-certain-X570-MEG-boards-allowing-the-Ryzen-7-5800X3D-to-hit-up-to-4-8-GHz.615319.0.html