Please pay attention: it is not possible to output 4K HDR @ 120Hz between your RTX 3070, 3080, 3090 video card and LG Oled CX TV via our HDMI switch.Bidirectional 8K HDMI Switch / Splitter: The HDMI switch allows you to connect two HDMI sources to one HDMI display (Switcher) or connect one HDMI source to switch between two HDMI displays (Splitter). Additional HDMI cables are required, but not included. in the packaging. The length of the HDMI cables connected to both ends of the switch should not exceed 3 meters respectively, otherwise it will easily cause an unstable connection in your HDMI displays. *** IMPORTANT NOTE: two screens CANNOT be displayed simultaneouslyUltra HDMI 8K Splitter for Dual HDMI 8K TV / Displays: supports 8K @ 60Hz, 4K @ 120Hz, 1080P @ 240Hz resolutions, offers you transfer rates up to 48Gbps and backward compatible with all previous HDMI standards. Connect a standard HDMI cable to enjoy visual effects. Note: If you want to output 8K @ 60Hz, 4K @ 120Hz, and 1080P @ 240Hz, please make sure your source devices, cable, and monitors can all support the resolution and refresh rate you need to outputConvenient Switching Between HDMI Sources and Displays: You can get Ultra HD 8K video and picture experiences on your big screen monitors and HDTVs through our 8K HDMI switch. You can switch between two sources or two displays by pressing the "Select" button in the HDMI Switches, this is a necessary step. *** Non-automatic switchWidely used in many occasions: Our 8K HDMI switcher / splitter is easy to operate and can be widely used in study, entertainment, work and other occasions, smooth ultra HD video and picture quality experience, multi-source and multi-screen switching, providing multiple possibilities for work and entertainment. Especially to connect with latest PS5 and Xbox, you can enjoy 4K @ 120Hz gaming experience