ASROCK B660M PG RIPTIDE - Confirmed non K 12th gen OC capabilities. Out on Asian markets, not sure about Western
https://youtu.be/nHgl8MKkJ7w
https://www.asrock.com/MB/Intel/B660M PG Riptide/index.asp#Specification
MSI MAG B660M MORTAR MAX WIFI DDR4 - Confirmed non K 12th gen OC capabilities by Hardware Unboxed and MSI. Soon to be released.
https://youtu.be/p1G6V6o08_Q
https://www.msi.com/Motherboard/MAG-B660M-MORTAR-MAX-WIFI-DDR4