My Galax B760M D4 White Phantom hits a power wall and drops frames with the 4K mod in RDR2, how do I fix this?

Riding through Saint Denis in 4K was a dream until the frame skips started hitting me like a brick wall. Checking the logs, the CPU core voltage on the Galax B760M D4 was jumping wildly between 1.1V and 1.2V, forcing the clock speeds to bounce between 3.6GHz and 4.8GHz. I tried the typical Windows 'High Performance' power plan, but that just pushed the CPU to 94℃, triggering a massive thermal throttle—totally useless. I eventually went into the BIOS, disabled PBO, and manually locked the all-core frequency at 4.0GHz while cranking the fan curve to aggressive. In RTSS, the frame time variance dropped from a messy 16-42ms down to a tight 13-17ms. I did have two random reboots right after locking the clocks, but a tiny tweak of the SoC voltage to 1.1V sorted it out. CPU temps now sit comfortably between 75-82℃. The frame time analyzer shows the stuttering is gone, and the power delivery is finally behaving.