https://wccftech.com/amd-ryzen-3000-series-support-on-existing-am4-boards-confirmed-by-asrock/

AMD’s brand new Zen 2 CPUs will be backwards compatible with current 300 series and 400 series AM4 motherboards, Asus and ASRock confirm.

We’re less than a month away from the debut of AMD’s next generation family of Ryzen 3000 series processors. With the launch quickly approaching we’ve seen some motherboard makers proclaim, mistakenly perhaps, that you will have to buy a new board to enjoy one of the new chips.