Why do you need a ultra high speed 8K HDMI 2.1 fiber optic cable? 1. No random screen flashes, dropouts, lag, or white dots. Passed the stringent low EMI (electro-magnetic interference) test, which protects against interference by nearby wireless devices. It ensures stable signal transmission and then delivers crisp, flawless video, Ultra-long distance lossless transmission signal. 2. No unsupported or compatibility issues. Completely supports all the features of HDMI 2.1 that you need, including 8K@60Hz, 4K@120Hz, 48Gbps bandwidth, eARC, dynamic HDR, HDCP 2.2&2.3, ALLM, QFT, QMS, VRR, and more. Perfectly backward compatible with HDMI 2.0b/2.0a/2.0/1.4/1.3/1.2/1.1 Supported Features: 48Gbps bandwidth Dynamic HDR 10 Enhanced Audio Return Channel (eARC) Auto Low Latency Mode (ALLM) Variable Refresh Rate (VRR) Quick Media Switching (QMS) Quick Frame Transport (QFT) DTS-HD Master Audio, DTS:X, Dolby TrueHD, Dolby Atmos HDCP 2.2 & 2.3 Ethernet ARC CEC Compatible with latest HDMI 2.1 devices: LG CX C9 B9 Sony X900H Z8H Samsung Q80T Q90T Nvidia RTX 3080/3090 Yamaha Denon Onkyo Marantz ... Blu-ray player Fire TV Roku PS4/5 Xbox ...