source: https://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0_faq.aspx#121Is HDMI 2.0 backwards compatible with HDMI 1.x?
Yes, all HDMI versions are fully backward compatible with all previous versions.
@ OPThere's more to it than that, though, and HDMI 1.4b simultaneously supports and does not support 1920x1080 at 120Hz. It supports the 120Hz 1080p throughput only for 3D processing, which it does by cloning the data packet for concurrent output to the display device. For 2D viewing – which is what almost all gamers mean when they want “120Hz” – HDMI 1.4b is stuck at just 60Hz for 1080p. This is commonly misunderstood in the HDMI 1.4b spec language.
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