FPS is bouncing all over the place in Dragon Age on my Galax H310M. Should I lock voltage?

During intense magic battles, the frame rate was bouncing wildly between 45 and 80 FPS, which was honestly jarring. The auto-voltage regulation on the Galax H310M Warrior has a response lag of about 18ms under sudden loads, causing the CPU cores to jump erratically between low and high frequencies. I tried the 'Ultimate Performance' power plan, but that just made the fans sound like a jet engine without actually fixing the stutters—a completely useless attempt. I eventually went into the BIOS, switched the CPU voltage from 'Auto' to a manual lock of 1.18V, and killed the C-State energy savings. In the RTSS frame time graph, the jagged saw-tooth pattern smoothed out into a clean line. I did hit a blue screen about 8 minutes into the game on my first attempt, but bumping the voltage to 1.22V made it rock solid. CPU and VRM temps are both hovering around 60-68℃. The erratic jumps are gone, though the board still feels a bit dated for this title.