Not sure what 'undervolt disabled from the windows power manager' is, can you post a pic.
Are you using the stock cooler ?
Some more system spec info might help someone offer suggestions.
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..