Originally Posted by cavu
For the record:
THERE IS NO SUCH THING AS A 120HZ CABLE
Anything related to 120Hz takes place entirely within the TV. The fastest refresh rate transmitted through an HDMI cable is 72Hz but usually are 24/30/48/60.
It is true no 120Hz HDTV accepts a 120Hz input and there are no 120Hz sources (yet).
The HDMI spec does support 120Hz (and even 200Hz, 240Hz) connection.
HDMI v1.3 provides for up to 10.2Gbps via a 340Mhz clock.
1920 (pixels wide) * 1080 (pixels high) * 120 (fps) *24 (bits per pixel) = 5.97Gbps. Even allowing for a 12% blanking interval would be well below the 10.2Gbps limit on an HDMI v1.3 TypeA conneciton.
If ever a source/sink required more bandwidth HDMI already has a Type B connection (29 pins vs 19 pins) that enables 20.4Gbps.
Your point is still valid. No 120Hz set is capable of 120Hz input today
however the spec is ready if/when they do in the future. Next generation consoles could support >60fps. If TV is already capable of 120Hz playback all that future TV would need to add is support for 120Hz input.