What's 27 inches across and has almost twice the pixel count of your puny 4K monitor? Dell's new UltraSharp 5K monitor, that's what. With a resolution of 5120x2880, the 27-inch monster has seven times as many pixels as your 1080p monitor, or four times as many as your 2560x1440 (1440p) monitor. It has a PPI of 218, which puts it on about par with the 15-inch MacBook Pro with Retina display (2880x1800). When it goes on sale around Christmas time -- for $2500 -- it will finally replace IBM's mythical 13-year-old T220/T221 as the highest-res desktop monitor.