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Yeah sorry, got a little uni preachy there. The reason the picture quality is better over HDMI than over I'm assuming component is due to a number of things, one there is no digital - analogue - digital conversion of the signal which adds noise and artifacts, second HDMI cables are typically better shielded than most component cables, and third HDMI is digital with 8b/10b encoding with error correction, so a low amount of data corruption can get corrected before display.

Component attenuates as the frequency increases, thus transmitting high resolution images over it results in the high frequency component (the fine detail) attenuating out more than the lower frequency components (the lower detail). Thats why a lot of TV's don't support 1080p over component, and why the jaggies are more prominent, because the higher frequency detail is lost over the signal. If you want to know more, look it up.