Great Pattern. This was very interesting. With TheatTek 2.1.1/NVidia 7800 I can see on pixel border. I am assuming that is zero overscan.
With MyHD 1080i, I did some adjusting. I can get to zero overscan horizontally, but the vertical never delivers the border, but it is close. Watching PBS-HD and some 4x3 content you can really see that some stations have not figured how to crop the broadcasts.
Oppo Beta Group
Oppo BDP-105D | Oppo HA-1 | Oppo PM-1 | Parasound A51 | Revel Salon, Voice, Studio | Velodyne HGS-15