Taiwanese PC maker ASUS dropped this gem yesterday ahead of Computex 2013 -- the PQ321, a professional-grade 31.5-inch 4K monitor. It features a 3840 x 2160-pixel (16:9, 140 ppi) 10-bit RGB (one billion colors) IGZO panel with LED backlight, 176-degree viewing angles, 350 cd/m2 brightness and 8ms GTG response time. Beyond its Ultra HD capability, the monitor comes with built-in stereo speakers (2W) plus height, tilt and swivel adjustments. It's wall-mountable (VESA) and only 35mm thick -- according to ASUS, that makes it the thinnest 4K monitor on the market today. Connectivity includes DisplayPort, 3.5mm audio, RS-232C and, for US models, dual HDMI inputs with picture-in-picture support. There's no word on pricing yet, but the PQ321 will be available in North America at the end of June and ASUS is expected to show the monitor in Taipei next week along with a 39-inch 4K model.