Gigabyte has gone P55 platform wide with USB 3.0 and SATA 3. Almost every board they offer with the LGA 1156 socket has a version available with SATA 3 and USB 3.0 built in. While SATA 3 and USB 3.0 isn't designed into the P55 chipset Gigabyte has found a solution to include it in this generations boards that will help mainstream SATA 3 and USB 3.0 faster.
We chose the longer harder road with the Gigabyte GA-P55A-UD6 and waited for a USB 3.0 device to test out on it. We not only have a USB 3.0 External drive to test we have the new Seagate Barracuda XT. It takes a while to test a motherboard by itself but when you add a new SATA 3 interface and drive, and a USB 3.0 drive and interface it gets crazy.