no bios are the same was gettin 30mh tweaked, and now tweaked i oly get 15-22
so you flashed your new card with a another card modded bios ?
the same card from the same manufacturer can have a many different bios version ...
Rom files are not interchangeable .
You can flash them to another another card(s) from the same manufacturer with the same bios version number , but then your hashrate will drop to lower 20's or under or just going up and down, card become unstable, you can totally destroy your card(s)
Higher ASIC quality cards have more overclocking potential...
I hope you saved the original bios file for your new card before flashed the rom.
My suggestion is flash back the original rom to your card , check your card, make sure its working with your original bios rom.
Then mod the original bios rom file, and flash your card with that modded rom...
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. Some of my card running over 30MH/s some is between 29.2-30MH/s STABLE !
My first priority was , creating a custom rom , with lower power draw and higher hash rate than stock .
, 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. Some of my card running over 30MH/s some is between 29.2-30MH/s STABLE !My first priority was , creating a custom rom , with lower power draw and higher hash rate than stock .
