Just now, TofuHaroto said:
Does the gigabyte b450m support zen 2?
That's not a specific board.
But from my experience, all motherboards (including even A320) will support Ryzen 3000 at this point.
When the manufacturer makes a board, they will place a BIOS on it that supports all the latest CPU's.
So since July 2019, all boards manufactured will support Ryzen 3000.
Unless the store has a REALLY old board sitting around, all boards out now will support Ryzen 3000