Those cards can have 4-5 different bios version if i remember right from my earlier builds
My project is completed today all , 16 cards installed with custom ROM's, Take me forever to mod all those BIOSes . YEP , i have 12 XFX rx 480 , same model number , but i had to create 7 different rom for those cards to work stable. I was not able to use 1 modded bios for all 12 cards . Higher ASIC quality cards have more overclocking potential for sure
, and much easier to mod those rom files for those cards:)
Also i got 4 Nitro 8GB OC , those card have 3 different BIOSes . ( 13-2E3470U.X4L / 13-2E3470U.X51 / 113-2E3472U.053 ) Rom files are not interchangeable . You can flash them to another nitro , but then your hashrate will drop to lower 20's or under or just going up and down.
Also this build is with 11260-01-20G , i had to mod 4-5 different bios file for those cards, i ordered the cards from different places.