Now i see the B450 from the same line are just 5$ more, so... the ryzen will suport the 3200mhz ram?The maximum speed supported by that motherboard is 3200mhz... but Asrock has yet to put together a memory Qualified Vendor List for Ryzen 3000(Matisse & Picasso) cpus: https://www.asrock.com/MB/AMD/A320M-HDV R4.0/index.asp#Support
It'll be a bit of a shot in the dark with what does, and doesn't work.