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  • 1) Your HDMI output is physically wired to the NVVIDIA HDMI output. 2) Your NVIDIA HDMI output probably has a max clock rate (can you achiever a higher framerate with a lower resolution?).
    – dirkt
    Commented Aug 24, 2019 at 3:34
  • While an Nvidia 20 series definitely should support up to 4k @ 60Hz, it is possible that Lenovo put something in the chain that does not support the refresh rate. You should check your manual to see if the HDMI output is limited in any way.
    – Mokubai
    Commented Aug 24, 2019 at 5:04