Here is some video footage I found while surfing of the next gen cards from nvidia that are to be released middle of June. A few examples of encoding HD movies and footage and using this new technology, HD encoding can be done at 2 x real time now. Yes, that is 2 x real time! check it out.
http://www.youtube.com/watch?v=8C_Pj1Ep4nw
http://www.youtube.com/watch?v=8C_Pj1Ep4nw