I have 10 rigs running 2 with ASUS Z270A, 6 with SKYBAY motherboards and 2 with ONDA motherboards.
All the rigs have the same GPUs and settings but the ONDA motherboards are giving me mh/s all over the board. I even tried a different CPU and it didnt help. I also tried to disable a few GPUs and stock clock settings as well as overclocking.
This issue used to happen on Win10 and I would increase the virtual memory and it would usually fix it.
on-board audio is disabled, I couldnt find 4G Decoding to make sure it was enabled.
Attached is the hash rates and what they are doing. https://forum.hiveos.farm/uploads/editor/50/5y4tstrkzq5e.png