I work on a Dell computer all day at work and I had a different brand computer prior to purchasing this Optiplex and lets say I can tell the difference. I am able to view images, no lag, the resolution is perfect and the fan is quiet although it scared me initially. The only reason I gave 4 stars and not 5 is because the dongle that was provided for the internet did not work. It would lag out and drop connection frequently so I forked out the money and purchased a separate one and since then I have had no issues with this unit.