Soldato
I have one more question to you - did you try to lower resolution in games, like from 2560x to 1920x? How does it look like?
Yes, I've tried different resolutions. They look "okay", in that they are displayed correctly just as you would expect, but that the sharpness is lost somewhat (as is the case with any LCD screen). The video cards software scaling is usually a little better than the internal scalar of a screen anyway, so it's just as good as it would be from (say) a Dell 3008 or similar screen.
As I said, you will have control over how the image is displayed via the nvidia / ATI control panel. The default is to fill the full screen (if the aspect ratio is the same), and add 'bars' only to account for aspect ratio - so if you display a 16:9 resolution on your 16:10 screen you will have thin black bars along the top and bottom. But, you can choose to stretch the image if you want, or you can choose a kind of 1:1 pixel mapping (so the image is reduced in size but stays sharp).
For use with a PC you won't come across anything that you "can't do" because of the lack of a scaler. The video card controls everything. It's only really an issue if you're working with an external source.