Here is the QVL ( Qualified Vender List) that Asus puts out for this mobo
https://www.asus.com/us/Motherboards/PRIME-X470-PRO/HelpDesk_QVL/
there are multiple pdf's on the page above ^ but your processor is a 2nd generation Ryzen so be sure to select that one
as long as you pick a ram module ( or set of modules ) from that document you will be good to go