HDMI Cable - 12ft HDMI Cable High-Speed Supports 4K Ethernet 3D Audio

"High Speed" is the rating used by HDMI companies to indicate cables that have the bandwidth to handle 1080p and greater video resolutions. You can think of bandwidth like a pipe.  A cable can be considered a "high speed HDMI cable" if it passes 1080p, but not be well enough made to handle 4K.