Be Quiet! showed off a unique ATX full-tower chassis at Computex, the Dark Base 900, featuring a fully reversible motherboard tray. This lets you change the interiors between a standard layout, in which the motherboard faces the left side of the chassis with its I/O up top; and an inverted (BTX-like) layout, in which it faces the right panel, with its I/O at the bottom. This is possible by pulling out the rear panel that's attached to the tray, and inverting it. This also gives you the flexibility of installing your motherboard, CPU cooler, and add-on cards outside the case. The case features room for a 420 mm x 140 mm radiator along its front panel.