You buying these numbers ?
"As for the mining performance itself, the GeForce RTX 3080 has a mining rate of 73-74 MH/s out of the box on Ethereum DaggerHashimoto algorithm. The performance reaches up to 82-84 MH/s and overclocking the card leads to a maximum performance output of up to 92-93 MH/s. Currently, the AMD Radeon RX 5700 XT outputs around 50-54 MH/s while the GeForce RTX 2080 Ti delivers up to 54 MH/s."
https://wccftech.com/nvidia-geforce-rtx-3080-ethereum-crypto-mining-performance-leaks-out/I've read that there will be overclocked version of this card in the future, of course you could probably overclock these cards...
yeah i think 75 to 90 is likely.
and i think running at 160-180 watts will let them do closer to the 75 and pushing at 225 watts will bring 90ish mh
personally my best guess is one of them a little better them two amd 5600 or 5700