What brand makes Alienware?

Dell
Alienware is an American computer hardware subsidiary of Dell. Their product range is dedicated to gaming computers which can be identified by their alien-themed designs. Alienware was founded in 1996 by Nelson Gonzalez and Alex Aguila.

Does Alienware use proprietary motherboards?

Older Alienware computers used common parts, but newer ones used propriety parts. Generally speaking, though, virtually everything is upgradeable.

Where do Alienware desktops ship from?

They’re made in China and shipped to a Dell building that distributes them wherever they need to go. Late shipping dates and whatnot are just Dell’s fault I guess. I just spoke with an “Alienware Expert”. They advised that the parts are made in china, but they are in fact assembled in Texas.