My Galax B760M D4 White Phantom reboots during UE5 rendering due to VRM heat. How do I stop this?

This board is dead silent for office work, but when it hits a UE5 workload, the VRM temps spike to 102℃, which is just pathetic. At those temps, the CPU clock crashes from 5.0GHz to 2.8GHz, turning my smooth demo into a slideshow. I tried limiting the maximum processor state to 90% in Windows, but that just doubled my render times—a complete waste of time that felt like sabotaging my own rig. I ended up redesigning the case airflow and strapped a tiny 4cm fan directly onto the VRM heatsink, then tweaked the CPU voltage down to 1.22V. In Cinebench R23 stress tests, the peak temp was finally pinned between 84-88℃, and the clock fluctuation dropped to just 120MHz. The only downside is a slight high-pitched whine from the small fan, which I only managed to tolerate by setting a stepped fan curve. Even at 95% CPU load, it now holds its boost clock. I exported the fan parameters from the BIOS, and the system response now feels incredibly tight.