HDMI and DisplayPort both keep increasing the peak transfer rates of data signals across their cables. This is necessary to support higher resolutions and refresh rates, as well as the extra signaling required for things like HDMI Deep Color and High Dynamic Range video, so if you want fancy video signals, you need fancy cable standards.

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Source: Hot Hardware – HDMI 2.1a Spec Revision Aims To Solve Your Short High Speed Cable Woes