Hi guys,
I have been mining ETH+SIA with 6 rx 570 nitro+ 4gb. OS: ethOS, PSU EVGA 1300W, claymore 10.2.

I got 29MHs each card for a long time. Then my MOBO was broken and I had to replace it with the same one (gigabyte z170 ud3). However, after that I couldn't get it over 24 mhs each.

I tried reimaging ethOS, update MOBO BIOS, reflash the BIOS of GPUs with the same ones that I used before but nothing worked.
One weird thing is that, with the same setting, I can get ~5200 for mining Cryptonight, which means the cards were OCed properly, I believe.

Could you please advice me?
Thank you a lot!