http://www.hexus.net/content/reviews...lld19JRD03MTE=Intel demonstrated the BTX 12.9 and 6.9 solutions – Grantsdale and Alderoowd – high performance in a small form factor; we believe that Intel has done this since they have seen the success of the Shuttle XPC solutions and the like. The idea of the BTX solution is that by reducing the size of the main board, and re-designing the airflow out of the vents they can get higher performance cooling in a smaller package.