I watched Gene’s HDMI video that was just released so I checked with LG on the C9 OLED. They assured me the HDMI 2.1 input accepts a 4K 120hz signal, I then asked what specific input GBPS it handles and they said they would check and get back to me. In lieu of Gene’s HDMI video it seems like a moot point unless you are PC gaming or will get the new Xbox or PlayStation which I plan on getting the Xbox. I’ll report back when I get full LG HDMI 2.1 specs.