Yeah the more I looked at stuff the option might be "greyed" out currently cause I don't have a 5000 series processor in socket.... Do you know what menus/screen u have to change or go to on a rog board bios?
I have a Asus B550 TUF board but it might be similar. Start on the AITweaker screen...then PBO...then down a bit to Curve Optimizer.
PBO settings should be there but Curve Optimizer screens might be missing entirely, or greyed out, if you don't have a 5000 series processor. CO comes with PBO2, available only on 5000 series processors.
There's another screen in Advanced settings, AMD Overclocking and then into PBO again but I'm not sure of the path exactly. If you find it, it will work too but do all your settings in one place only.
But go search YouTube, there are a lot of how-to's. Just look for 5800X though as it's similar to 5800X3d. Results and settings will differ but the process is the same. But then, don't ever use someone else's tweaked settings for overclocking/undervolting since every processor is peculiar even if identical models.
View: https://www.youtube.com/watch?v=dfkrp25dpQ0