https://wccftech.com/amd-x670-upcoming-am4-chipset-to-be-produced-by-third-party/

Currently, AMD's X570 chipset is produced in-house, a change from previous 400-series and 300-series chipsets being produced by a third party, and it seems as if X570's successor, the alleged ‘X670’ will return to third-party production.

According to a report originating from MyDrivers, AMD's upcoming 600-series chipsets will be outsourced similarly to how ASMedia produced AMD's 300-series and 400-series chipsets, and other rumors point to the B550 chipset being produced by ASMedia as well.