Most TVs, digital flat panel or otherwise, still implement what is known as over scan. It basically causes about 15% of the border of your screen to, well, be wasted. It's a relic that should have been done away with 30 years ago, but we're still stuck with it.
While the TV itself can translate a pixel-for-pixel image, as it should, the software inside the TV that identifies and translates the signal from your currently selected port may decide that you should have over scan. Some television sets allow you to remap the inputs or change their input type to dot-for-dot, which would be just what you need, while others allow you to change the input to a PC type, which effectively does the same thing.
Using the VGA input on a flat panel television will also give you a dot-for-dot image, but it uses analog signaling and yes, you can expect a good deal of signal degradation unless you have a short, high quality cable, at which point you'll get less degradation, but you'll still get it.
Conversely, even if the TV is newer, and smart enough to give you a dot-for-dot picture when connecting to a PC as the source, NVIDIA still hasn't wrapped their collective heads around not treating any detected TV as a TV, and as such, whether the TV is happy with PC input or not, NVIDIA chooses instead to send TV output to the TV, so the TV reverts to over scan, and also enjoys degraded color output.
The only fix I've ever found for NVIDIA's idiotic shenanigans is to create a custom .INF driver installation file for your connected TV, and basically trick the graphics card into thinking it's a computer monitor and not a television. This is not a trivial task and I don't have time tonight to write a tutorial for it, so if you choose to go this route, I suggest you do some learning.
A simple driver toggle would fix the situation, but NVIDIA has failed to ever provide such a thing, presumably failing to recognize that they have a pretty dumb problem that they themselves have caused.
AMD on the other hand, chooses not to send TV signaling instead of PC signaling, and once scaling has been corrected for in their Catalyst Control Center, all is well, provided the TV recognizes and sets a dot-for-dot mode for your connected PC.
In the end, if your TV forces over scan, there is nothing you can do but to compensate by using the scaling and sizing controls built into NVIDIA's and AMD's control panels for their respective graphics cards. That's essentially what those controls are for, to fit your desktop to your screen, and yes, you lose quality, but it's at least a solution.
I strongly suggest you read the manual for your TV and go through it's available menu settings to see if you have either a PC mode or a dot-for-dot mode that you can set the input you have your computer plugged into to.
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