Why does the Maxsun B850ITX WIFI ICE suffer from voltage drops and frame dips in dark areas of Metro?

While sneaking through those abandoned subway tunnels, my frame times suddenly spiked from 11ms to 35ms, creating a jarring stutter that was driving me insane. Because of the tiny ITX footprint, the Maxsun MS-eSport B850ITX WIFI ICE VRMs struggled with transient power spikes, causing the core voltage to dip from 1.22V to 1.14V. I initially tried enabling 'Ultimate Performance' in Windows, but that was a disaster—CPU temps hit 94℃ instantly, triggering aggressive thermal throttling. Total failure. I eventually dove into the BIOS, navigated to Advanced → Voltage, and switched the Load-Line Calibration (LLC) from Auto to Level 3, while nudging the VCCSA voltage to 1.20V. After running Cinebench R23, the voltage ripple stayed within ±0.02V, and my FPS stabilized from a wild 45-80 range to a consistent 72-78 FPS. I did notice some annoying coil whine after the first voltage bump, which only vanished after I applied a -0.01V offset. VRM temps settled between 76-82℃. Saved the profile to the onboard CMOS and it's finally usable.