HDMI 2.1 can unlock better graphics on the Xbox Series X and PlayStation 5.
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HDMI 2.1 Cable Specs and Bandwidth Requirements Revealed
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When Do I Really Need HDMI 2.1 or Is HDMI 2.0 Enough?
Do you need new HDMI cables for HDR? - CNET
HDMI 2.1 Explained – Everything You Need to Know - ViewSonic Library
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HDMI 2.1: What you need to know - CNET
TV industry paves way for humongously high-res video - CNET