Set your display to 1650x1080 since thats the native resolution of your LCD. Thats one probable reason why your display blurry.
Some LCD with native resolution of 1650x1080P are able to display 1080P(One of my old 20 inch viewsonic). To be able to that i force the resolution on the video card/display setup.
DVI or HDMI port had nothing to do with it.