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Alright so I have the X85K which says supports 4k 120hz and I bought a HDMI 2.1 cable but I can't get 4k 120 work for the life of me. I've tried

4K@120hz HDMI Selector Switch, HDMI Switcher 2 in 1 Out, HDMI Switch Splitter,Aluminum HDMI 2.1 Bi-Directional Switch, Support 8K@60hz and 4K@120hz

This Blackbird 4K HDMI Audio Extractor extracts the audio signals from HDMI video streams. It supports analog stereo audio, as well as high‐definition multichannel audio streams over the S/PDIF digital optical audio output. It supports video resolutions up to 4K@60Hz YCbCr 4:4:4, 10‐bit High Dynamic Range (HDR) passthrough, and audio sampling rates up to 192kHz. It is fully compliant with the HDMI 2.0b and HDCP 2.2 standards and provides up to 18Gbps video bandwidth.

Monoprice 24278 Blackbird 4K HDMI Audio Extractor, 18Gbps, HDCP 2.2

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