I am using the component dongle on my sapphire & my picture lined up almost perfectly with just enough overscan.
I just didn't have to adjust much.
Just ran the HDTV wizard & choose 480i or p I forget which then nudged the desktop to be more centered.
The picture is amazing.
I did have to play with the color adjustments to get the correct skin tones, but other than that I didn't have a problem.
I have never used the svideo out on this card. Only the component.