HIS RX570 8GB and 2 Gigabyte 570 4g Gaming


Hi everybody,
I have an issue with my AMD card.
First i’m trying to mod my HIS 570 by myself cause I can’t find any bios with my HIS so I try to change timeming 1750 to 2000 and when mining cryptonight it show as 600h/s. After that I try to mod two Gigabyte 570 gaming that I take from this site from Anorak then the hash rate is 599 but hash rate of His is slow down to 550h/s.

When I’m trying to mining ethash it says 24mhs

Anyone meet this issue before .