That definitely sounds like you've got something set incorrectly somewhere. In my experience the Intel integrated graphics, such as used in the NUC,...
Someone just gave me an Intel NUC and I installed Ubuntu 20.04 on it. In comparing the display quality on the same 32" monitor between my old Ubuntu...
I'm no server expert and don't work with RAID, so my input can only be of the general sort. The question here is: what have you done to your system?...