Why do frame drops occur in Helldivers 2 on Biostar A320MH PRO?

Anxiety spiked as teammates died during stuttering on the Biostar board. Manual overclocking failed and triggered a blue screen. Using GamePP Power Plan Switcher, I set High Performance mode and locked core counts. Cinebench showed stable 4.8-5.0GHz frequency and FPS increased from 60 to 85.