What is the difference between a Standard HDMI cable and a so-called High-Speed HDMI cable?
The latest version of HDMI specificaitons is 1.3a, which was published on Nov. 10, 2006. In this version, HDMI cables fall into two categories: Category 1 and Category 2. HDMI Cat-1 cable, i.e. Standard HDMI cable supports TMDS clockfrequencies up to 74.25MHz(2.22 Gbps), which is the equivalent of a 1080i signal. HDMI Cat-2 cable, i.e. High-Speed HDMI cable supports TMDS clock frequencies up to 340MHz(10.2 Gbps), which is the highest bandwidth currently available, and equivalent to a 1080p resolution. Obviously any HDMI Cat-2 cable is back-compatible with Cat-1 specifications.
