OC Problem
OC Problem
I question whether the motherboard BIOS includes specific IGPU clock tweaks, but it's possible they exist—you may need to search thoroughly if they are present.
If unsuccessful,
Ryzen Master Software
could let you modify the IGPU clock speeds, though I’m not certain. It’s worth downloading and testing yourself.
Make sure to study overclocking guidelines thoroughly before proceeding, and keep an eye on temperatures during any experiments.