People keep showing stuff like this so you have to ask yourself, why would Nvidia crank it to 450w when it can get 90-95% of the performance at 70% of the power consumption.
Not sure about 11, they seem to have left a lot of room (some OC strix edition reach the 570 watt type, so the 600 watt edition talk seem to have a plan at some point, but like it show very diminishing return already)It suggests to me that the AMD flagship was much to close to comfort for Nvidia so they cranked everything to 11.
Yes has we saw, at least on some title AMD does come really close that those 5-6% for absurd power pay off for them (and if they build the cards for a giant power anyway before knowing how efficient their affair would be and what AMD plan were, may has well), the general point was more that lovelace do seem has potentially quite efficiency, yet to be certain despite the talk around RDNA 3 that they will have an edge there at least one that change things. That AMD would get equal with a worst node and the surcharge added by the interprocess would be quite impressive already, even with the ram difference.