sigh...
http://en.wikipedia.org/wiki/Component_cable
"Component video is capable of producing signals such as 480p, 576p, 720p, 1080i, and 1080p, but, according to some, digital connections such as DVI (video only) and HDMI (which can also include up to 8 channels of audio) generally give better results at the higher resolutions (up to 1080p). HDMI also includes both a video and audio signal in a single cable."