Minimum recommended I have seen is 600W psu with 2 x 8 pin PCIe, AMD says 650W (Ref. design ?) and Sapphire suggests 750W with 2 x 8 pin.
Modern cards need stable/consistent supply from the 12v psu rail, invest in a quality make/model psu.
Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T..