Cant get more than 1060mhz memory... after that the card crashes.. Others 3 are working perfect on 1305
clock them all to 1030 memory and lower power to 230 watts.
come back and tell us your numbers.
you will kill the cards the way you are mining them.
It appears you got three great cards and one okay card.
The trick is to find best setting for all four of them
the lesser card
may want 220 watts and 1000
or 220 watts and 1030
the good cards may want
230 watts and 1100
or 225 watt and 1150
I know they are outstanding compared to the lesser one
but pushing them to death 💀 and getting rma’s is foolish since you may never replacements as good as these three.
I would be willing to bet they will not do 246 watts and 1305 ram speed for two or three years
but they may get 230 watts and 1150 ram speed for years.
they are a sure thing outstanding chips.