The BTX Form Factor is the latest in motherboard designs. The major
concern behind this design is the layout of heat-producing components such
as chipsets, processors, and graphics controllers. This design specifies that all
heat-producing components can use the primary airflow of the computer
thereby reducing the need for additional cooling fans that produce more
noise. The BTX Form Factor specifies better placement of components for
backpanel I/O controllers. Although it is smaller than the Micro ATX in size,
the BTX design is scalable and can be taken to the tower-size cases.