480p is the standard for the xbox and tv. I have the HDTV cable for my xbox going to my hdtv and i was suprised that theres only like 3 games that support hdtv right now anyway for xbox.
You wont get 480p without the hdtv hook ups you only get 480i some games do 720p I was hoping that the hdtv box that comes with my video card would work with my xbox.