Engadget posted a story that Alienware has made Ubuntu an OS option for its X51 small form-factor gaming rig

It'll come with Linux-friendly drivers from NVIDIA right out of the box, and you can of course install Steam for Linux on it from the get-go. As a reminder, the X51 is available in Core i3, Core i5 and Core i7 models, and can be upgraded to 8GB of RAM with 1TB of storage, with either a NVIDIA GeForce GT545 or a GTX 555 card.

  Alienware X51 gaming PC now available with Ubuntu, starts at $600