There are rumors about 48GB 3090 with older GDDR6 chips so having the same config for 3080 wouldn't be unexpected, at least until Micron could produce 2GB GDDR6

There are rumors about 48GB 3090 with older GDDR6 chips so having the same config for 3080 wouldn't be unexpected, at least until Micron could produce 2GB GDDR6X chips.