This compact unit is very power efficient and with enough processing horse-power, except for the weak on-board video, which is only good for one 1920*1080 display at near 60Hz refresh rate.  Nevertheless, I find this unit running great with my intensive circuit simulation/emulation, schematic design and layout, and etc.BTW, to use multiple displays (I usually use 3, sometimes 4), adding an external docking station (I have my DELL D3100 USB 3.0 docking station) is almost a must (especially with 4k displays).If you use two high def displays with the on-board two HDMI's, don't be surprised as I did when your keyboard and mouse become sluggish every now and then.  It is because the on-board video is too weak to handle them, either a decent video card or a capable docking station will solve that problem.