Each of these 4K wallpapers (that's 3840x2160, pixel fans) has been set to a desktop-friendly 16:9 aspect ratio, and with minimal compression so they look super sharp on your monitor.

With the buzz around 4K technology and Ultra HD building ... Ultra HD refers to a product that has a minimum resolution of 3840x2160 pixels with a 16:9 aspect ratio. Generally speaking, it's ...