Why does my Huntkey Blizzard T620 cause my PC to shut down during large scene loads in Red Dead Redemption 2?

This was absolutely ridiculous—playing RDR2 shouldn't be a stress test for my PSU's survival. The 12V rail on the Huntkey Blizzard T620 Snow was tripping OCP (Over Current Protection) during transient power spikes from my GPU, killing the system in about 1.5ms. I first tried capping the GPU power limit to 70%, but my frames dropped from 100 to 70, which was unacceptable. I eventually switched the PSU output mode to High Performance and swapped to higher-spec native 16-pin cables to reduce transmission loss. Using a power analyzer, I saw the transients flatten out between 600W - 700W, and the shutdowns stopped completely. I actually had a scare when I didn't seat the new cable fully, triggering an overheat alarm until I pushed it in with a satisfying click. Now, the PSU fan stays at 1400 RPM with internal temps between 45°C - 52°C. Exporting the load profile confirmed the stability, though the PSU fan is a bit louder than I'd like.