This is the hardest and most confusing information to find. I've been trying to find if 4K@120Hz output is available, as I'm looking to purchase a new desktop and I use HDR tv's as monitors.
My experience:
HDMI supports 4k@30Hz
Display Port 4k@60Hz
Don't know what AMD Radeon RX Vega 7 integrated GPU is.
Nvidia specs. say the RTX 2060 supports HDMI 2.0b (don't know what "b" is. DisplayPort 1.4a (don't know what "a" is. (Do these a and b specs support 120Hz?)
They have DisplayPort to HDMI adapters, you must get a adapter that specifically states it support 60Hz, same with all cables. I've searched for adapters that support 120Hz and haven't found any.
This is the most recent article I have found:
https://www.howtogeek.com/661325/should-you-use-hdmi-displayport-usb-c-or-thunderbolt-for-a-4k-moni/Seems as if 4k@120Hz is currently not supported.
Just start plugging in to ports and please, let us know what you discover!!!
https://www.howtogeek.com/305410/hdmi-vs-displayport-vs-dvi-which-port-do-you-want-on-your-new-compu...