Yes, that is correct. The above components are installed in the Alienware 17 aka (Alienware M17x R5) motherboard, so we need to add that motherboard in addition to the 18/M18x R3.
The "official" names are Alienware 17 and Alienware 18. That is also what shows in CPU-Z.
Here are screen shots for both motherboards:
Alienware 17: http://i.imgur.com/OgIegWz.jpg
Alienware 18: http://i.imgur.com/htgonEm.jpg