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Sunspark Thanks for the info.
I checked the technical info and the motherboard the NUC8 uses doesnโt have a genuine HDMI header on the motherboard, it is a DisplayPort header with a built in converter to HDMI. There is only 1 HDMI port on the NUC8 with no other display ports.
I have never been able to use DP comfortably, even on a sky lake Lenovo USFF machine I have. I installed W7 with the earliest Lenovo supported driver I could find, however I still had symptoms. I suspect the VBIOS is doing something to the DP signal or maybe auto enabling dithering.