I do it with MSI Afterburner, then do stress tests in 3D Mark to make sure it’s stable. As long as you’re not over-volting you’re fairly safe to experiment. You can either do a flat undevolt, or you can set up a custom curve. Also like another commenter here said, changing the fan curve to actually engage the fans sooner helps keep the temps down, usually the default fan curve prioritizes silence to a disturbing degree.