The AMD RX6950XT could be the 3090Ti we all want, the best high end GPU from Nvidia that I like for mining is 3080s, I don't want the 3090s because they are unstable, you gain 120+ MH mining and after minutes the hashrate goes down, if 6950XT can beat 3090ti like what I heard then this might be the most powerful single GPU for mining.
Hashrate goes down because of memory temp not the gpu itself. So change the factory thermal pads with 15w ones and you are good to go. The 6950 like 6900 will fail to deliver what it costs, the reason the 6900 is the only gpu lower than msrp right now is because is not worth the money, not even for gaming.