I didn't try pushing voltage with any of the 3 stock bios. They all are the same as far as I can tell. 516w limits. If you hook up the voltage read point and do the math off of it up youll be able to calculate actual power draw. The oled isn't very accurate. My oled constantly says my card is pulling 510-530w in port royal. But I can see that my clocks are dropping (and not due to gpu boost) when running stock bios.
Not all cards pull equal power. Take both my 3090s for instance. My original launch day 3090 KP pulls well in excess of 500w and even when gaming is always hitting off the 520w power limit. Itll pull around 550w in timespy. My 2nd card (Jan 2021) barely pulls 440w at the same clocks. My launch card scales better with voltage and cold but is a "worse" card to daily drive as it runs 1-2C hotter and always drops clocks unless I'm using the xoc bios. It has everything to do with leakage and asic quality.