The dock should work fine for video purposes, but don't expect it to power the notebook -- no dock is going to be able to provide power to that level of notebook computer.  You must have the original AC adapter connected to the system at all times.  
New to asking questions on any platform so bear with me. I just received my Alienware x17 R2 and attempted to connect it to my Dell K16A dock that I bought about 4 years ago. When I connect the two, a low wattage warning comes up and I'm unsure of what to do? I need to run two 32" monitors so a docking station is a must have item. So if my K16A can't work with the x17 R2 I could use a recommendation for a docking station that will work please.
x17 R2, run on a K16A Dock?