I'll have to check what drivers I have. But you are saying that in the Nvidia settings within the monitor drivers they have the tv's listed? Nice. So you aren't using PowerStrip at all?
I got the 720p res to work with powerstrip. No overscan and very little underscan. The only problem I have is in the middle of the screen, horizontally, it has a jitter. Kinda odd thing really, not sure what to call the problem. It is not stable, and sways side to side a small bit. Not to noticable during action scenes, but still scenes it is very annoying.
ANy idea what cause that? Or if the switch to DVI-HDMI cable would eliminate that?