Usually overscan is a setting on the TV, and has nothing to do with the HDMI cable or the GPU drivers. And "cable quality" doesn't affect the picture that comes through an HDMI cable at all, provided the cable conforms to the latest revision, HDMI 1.4a, as OcelotRex said. When the guy at the store tries to tell you that the $50 cable is better than the $15 cable, and they're both 1.4a, laugh at him and buy the $15 one.
There are some drivers which include a "TV mode" of some kind which will attempt to correct picture scaling if it knows you've connected the card to an HDTV, but for all intents and purposes, since the advent of 1920x1080 TVs with all digital inputs, these modes are completely unnecessary and have been removed from current nVidia and AMD drivers as far as I know.
Just connect it to the TV like you would any 1920x1080 monitor, and make sure any scanning settings on the TV are turned off/set to native.