All New Industrial Tower Server Chassis 21.5” depth, ideal for conventional industrial applications YY-R455 equipped with anti-vibration cage and dust-proof filter, can be the multi-purpose ATX server case, support full length GPU card and extended ATX motherboard. Different from the R445, the R455 has a deeper structure which can contain a bigger extended ATX mother board. Therefore, it can deal with tougher tasks with more profession hardware. With total 5 different hardware rack configuration, it can be used for different tasks and environment. It is the best choice for users who're looking for a universal PC/ server solution.