And how does it carry soundI thought DisplayPort was audio only?
Nope. Displayport carries both digital audio and video.
http://www.pcworld.com/article/2030...-which-display-interface-reigns-supreme-.html
----------
There is officially no such thing as an Quad HD resolution. Some TV-set makers used to call their TVs Quad HD but they all agreed to use the same marketing term Ultra-HD. There is 4K Ultra-HD (formally know as 4K) or 8K Ultra HD. The 4K stands for the resolution of 3840 × 2160, 4096 x 2560, 4096 × 2160 or 4096 × 1714 depending what the screen is used for.
I remember in '08 when Westinghouse - of all brands - introduced their 56" Quad HDTV for the princely sum of $50,000!
http://www.engadget.com/2008/06/21/westinghouses-56-inch-d56qx1-quad-hd-display-on-sale-for-50-00/