My Manli RTX 5090 D keeps rebooting during high-detail renders in Cities Skylines II. Power limit?

This MOD is basically trying to melt my PSU. Every time I zoomed into the city details, the whole PC would just black screen and reboot—it was beyond frustrating. The GDDR7 memory on the Manli RTX 5090 D v2 OC pulls insane transient spikes up to 600W during heavy renders, which just trips the PSU's OCP. I tried throwing a bigger PSU at it, but the crashes kept happening, which just proved that brute-forcing hardware isn't the answer. I used software to cap the power limit at 400W and applied a -0.05V offset to the core to improve efficiency. After 10 hours of rendering, zero crashes and only a 3% performance hit. I did hit a BSOD during loading screens when I first undervolted, but a tiny +0.01V tweak fixed it. GPU temps are now 65℃ - 72℃ with fans at 1600 RPM. I've exported this voltage profile so I never have to deal with those reboots again.