Hi Ruud, thank you for joining our forum! 

The Dell DA200 doesn’t support resolutions above 1920x1080p Full HD. The HDMI 2.0 SKU’s we offer, including the CAC-1504, do support resolutions up to 3840x2160p at 60Hz as well as specific resolutions inbetween like the 2560×1080 21:9 ratio of the LG ratio, which isn’t very common. (same with 3840x1440p).   

For your information, we expect our CSV-1534 Mini Dock which supports HDMI 2.0 too soon: http://club-3d.com/index.php/products/reader.en/product/usb-30-type-c-to-hdmi-20-usb-mini-dock.html