Most of the GT1’s depth is designed to allow long graphics cards and big drives to fit at the same horizontal level, and the case even has nine 5.25” front-panel bays to allow installation of hot-swap backplanes, digital fan controllers, USB 3.1 breakout panels and the like. Those without a bay panel adapter such as the one included with ASRock’s Z170 Extreme6 are stuck with a pair of USB 3.0 Type A and a pair of USB 2.0 ports.
Arguments whether a USB 3.0 front-panel header can handle USB 3.1 Gen 2 transfers are mute, due to combined cable-length concerns. This prevents motherboard manufacturers from considering the front-panel header’s practicality for direct-plug devices such as Type-C thumb drives, though applying a “Gen 1” label to a Type-C front-panel port might be an option for case manufacturers. Until engineers can reach an agreement on front-panel Gen 2, we’re told that the only options are an old-fashioned I/O-panel extension cable hanging out the back of a case with a repeater on the port end, or a bay device.
Hiding around back, the GT1’s not-so-secret added features include a removable/reversible motherboard tray, a cover over the power supply, and an extension power cable mounting hole next to the power supply cover. Those latter two items hint to an internal power supply mount.