Overscan / underscan and pixel-per-pixel display

Hello everyone!

I have win 7 ultimate 64 and an ATI 3450 connectet to a monitor (DVI) and a toshiba 37rv TV (HDMI). I am using the latest catalyst drivers.

The image on the tv did not cover the whole area, showing black bars on the 4 edges. So I changed the "scaling option" from the default 8% to 0%.

However, at 0% I have the opposite problem, i.e. a bit of image goes "outside" the TV visible area. The setting that looks the closest to a 1:1 representation seems to be a scaling option of 5%, but still that's not perfect, i.e. I don't get a pixel per pixel image (I tested that looking at an image made of black and white lines with width of 1 pixel)

Any idea?! This is driving me insane...

Thanks,
diodorus