Я не спец и может не правильно выразился. Но через HDMI 1920 Х 1080 картинка выглядит намного лучше, чем просто изменить в драйверах и БзБ. А ещё прочитал вот это:

Interpolation

The DELL U2711 has a sophisticated scaling solution. In terms of quality, this goes much further than simple point sampling, which is still used by some screens for scaling, regardless of the source aspect ratio. In the meantime, the trend is moving clearly towards implementing more sophisticated solutions. For playback via PC, the user is therefore not fundamentally dependent on allowing the graphics card to take on the scaling.
http://www.prad.de/en/monitore/revie...#Interpolation

The scaler on the DELL U2711 functions well. Qualitatively, it delivers a considerably better performance than scaling via the graphics card. In light of the high resolution, this is important. Should the performance in complicated games not be sufficient for the native resolution and should the user want full-screen display nonetheless, one should select the highest resolution that the computer can still display without juddering. This ensures the maximum amount of details possible for the original signal.
http://www.prad.de/en/monitore/revie...11-part14.html

Может сделал кашу но то, что картинка лучше это факт.