In crowded areas of Black Desert, my Corsair LPX 3200 keeps dropping frequency and causing lag. Why?

In the middle of a crowded city, my FPS would suddenly tank from 90 down to 30—it was enough to make me want to smash my keyboard. HWInfo showed the Corsair Vengeance LPX frequency was swinging wildly between 2133MHz - 3200MHz, clearly some annoying motherboard power-saving feature. I tried enabling 'High Performance' in Windows power options, but the frequency still fluctuated; surface-level tweaks are useless against BIOS-level hardware behavior. I went into the BIOS, changed the memory frequency from Auto to a manual lock of 3200MHz, and nuked all C-State power savings, while nudging the SoC voltage to 1.1V. Under stress tests, the frequency finally stayed dead-locked at 3200MHz, and the FPS variance tightened to 82 - 88 FPS. My CPU temp jumped by 5℃ after the lock, so I had to adjust my fan curves to keep it cool. RAM temps are 44℃ - 50℃ at 1.35V. After backing up the BIOS profile, frame times are finally stable at 5.1ms - 6.4ms.