The new BTX form factor specification gives developers options to balance thermal management, acoustics, system performance, and size in the system form factors and stylish designs that are desired in today's products. The BTX form factor is a clear break from previous ATX form factor layouts and was developed with emerging technologies such as Serial ATA, USB 2.0, and PCI Express* in mind. In addition to smaller than microATX system sizes, BTX also was designed to scale up to tower size systems using the same core layout by increasing the number of system slots included.
You can get more information about BTX over here http://www.formfactors.com or you can download the developers specifications over here http://www.formfactors.org/developer...X_Spec_1_0.pdf
Bem o formanto ATX ta indo pro saco, tava mais que na cara neh, barramento PCI-EXPRESS no horizonte não me admira essa nova padronização de mobo alias o ATX ja ta meio antigo neh. Como eu falei antes é uma época muito ruim para se fazer atualização :/