My FTW3 Ultra never really got above 400W - spikes only - and PWR Perfcaps in the high 1800's low 1900's, but I've had a few cards in the last months that I've played with - and then passed on to friends / family.
Of the different cards I've used - the power draw is highly dependent on binning - here using custom curves to achieve maximum stable clocks at lowest voltage (then flat undervolt to stay under the boost clock / power target - running up against perfcap PWR). There is some variability in clock depending on the test - but for example superposition 1080p extreme - these are the takeaways for me.
Asus tuf 3090 - 1980 at 390w
Asus tuf oc 3090 - 2025 at 390w
Asus Strix 3090 - 2010 at 480w (there is more in this one - but needs a bit of fine tuning - maybe a repaste - a friend is going to block this one and custom loop) Interestingly the mlcc's are tan colored - mem was good past +1250 (best of all that I've seen)
Asus Strix 3090 - 2070+ at 480w (heat limits clock here) - the mlcc's are black on this one - and it is an amazing clocker at low volts (2010 is doable below .9v) mem limits out at +750.
Evga FTW3 Ultra 3090 - 1940-1965 at 400W. Erratic clocking behavior - but stable, and effective quiet cooling.
I'm confident that the EVGA card will boost higher - if given more power - but at first glance - appears to suffer the worst binning of all the cards I've used. Locked in at 1980 no prob with a 2 pin bios. PCIE slot draw was ~75-80w. PCI-e 8pin #3 was 30-40% less at all times compared to 1 and 2.
EDIT:
Should add to refute the EVGA suspicion of external factors (psu inadequate etc) - my testing has compared the use of 2 different corsair ax1600i's in single or multirail. Motherboards include x299 dark with 10980xe, either using or removing the supplementary pci-e power connector to the board, b550-i strix with 5800x, and Aorus Master with 9900k. The only thing I haven't tried is running the gpu off a completely separate power supply from the main system. Not sure this would make much difference though. The problem appears to lie with the card / bios / power distribution / power sensing / load balancing / on the FTW3 ultra itself. Suspect that the PCIE slot draw is limiting the card from drawing further from the 8pins.