Hello all. Today I built two rigs:

Gigabyte GA-Z170X Motherboard
Windows 10
Five Sapphire Nitro+ RX580.

Both have same issue:

GPU0 5Mh/s
GPU1 22 Mh/s
GPU2 22 Mh/s
GPU3 22 Mh/s
GPU4 22 Mh/s

How can I put GPU0 at 22 Mh/s like others?
Is it possible to increase from 22 Mh/s to a better Mh/s?

Thank you all.