This is all I have done:
-Updated the nvidia driver to version 465.31.
-Swith the vga’s to see if each one works individually, and indeed they all work.
-Tested alternating on the different PCIE ports.
-I tried connecting one via USB and one riser.
-Switch the SSD with HiveOS from the SATA port to a USB port using an adapter.
-Revised the BIOS settings
I’ve run out of ideas, and the last one I have left is to try mining on Windows, maybe it’s a question of compatibility with Linux, being a new motherboard.