So have also tried the xoc Bios with maxed out powerslider and a little plus on the core and the mem. Max Power draw no changes to the normal OC Bios. Card Max Temp was 58 degrees Celsius with 100% Fans it never draws more than 430 Watts on benches. Even in Gaming my Card was never above 460 Watts(for one second only) always between 380-411 Watts with good cooling and so on...i had two others 3090 before and eg a Phantom GS draws standard 420 Watts steady and when you max the powerslider it stays always at 470Watt during Gaming and so on. If i put the slider on the FTW3 Ultra to 450Watt it draws maximaly 380-415 with little Peaks to 430Watt. Its a great card but this is a little bit annoying because we all spend a lot of money to tweak the cards to our liking. Besides that the card works great (2014 Taiwan December Modell black lips). I hope they can sort out for all users.
Edit Pcie Power draw is always between 74-77 Watt.