Since I am still toying with my hybrid card and seeing OC potential I spent some time today and was able to get over 118% TDP and the 450W. Probably somehow the perfect storm. I was just running MSI Kombustor using the (GL) msi-01 (burn-in mode) Stress test. It wasn't stable at these speeds but got the juice it needed. Made in Taiwan serial starting with 2114 using "EVGA GeForce RTX 3080 FTW3 HYBRID - BIOS 1 (Normal)" from OP.
Just put +699 on the mem and +180 on the core, voltage/power sliders maxed out. Oh and 100% fans.. not sure if that mattered somehow. (maybe could have turned off the lights for more juice?) Oh well ¯\_(ツ)_/¯ since the hardware looks capable hopefully more XOC bios tweaks can do something although this issue sounds more hardware related.
Board Power Draw: 451.5W
PCIe Slot Power: 58.5W
8-Pin #1 Power: 143.4W
8-Pin #2 Power: 154.0W
8-Pin #3 Power: 96.8W
Power Consumption (%): 118.8 TDP
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