RAM 8GB (1x8GB) 2666MHz ddr4 + 1X free slot I wish that site would review the generation 10 UHD GPU! Still have not seen benchmarks. 'HDMI 2.0 however is still only supported with an external converter chip (LSPCon).' Also my experience has been - twice! - that USB-C connectors have much lower plug-unplug longevity than specified (10K). Yes, this is definitely bleeding edge activity.

Someone else may know I've never used USB-C for video output. That is a good sign! Alternate mode is how USB-C cables carry DisplayPort or HDMI protocol. I found out on Eizo site that notebook should has USB Alternate Mode, is it anything special or is it standard? You should contact Dell and/or Asus support. What makes you think that the USB-C ports are connected to the GPU, especially if these laptops have cheapo HDMI 1.4? I don't think it's possible for anyone to answer your question without knowing the specific models. Both notebooks have USB-C (Dell has type-C 3.1/3.2 Gen 1, Asus has Type-C 3.1 Gen 1) so via USB to DisplayPort cable should I be able to output 10-bit colors (with UHD 620)?

Intel uhd 620 graphics