I'm sure you can dual-box on it. I have used my laptop to dual-box before and it is just over a year old, ie less power then yours. Now I do have to turn down the graphics a bit and turn off sound, but I get 15FPS+ in Shatt.

My personal test for how many WoWs a computer can handle is what FPS they get in Shatt, which is the laggiest most graphically demanding zone I know.