Think Big. Build Small. O11D MINI adding to the O11 Dynamic series, the classic and modern looking. A case that would accommodate the maximum number of water-cooling configurations without being oversized. With a modular back panel design, the user has the option to choose from 3 slots/ 5 slots/ 7 slots I/O shield to optimize the case to the configuration of user’s choice. Supports mini-ITX, micro-ATX, ATX, and E-ATX motherboard sizes. and up to 9 fans to cool the chassis. With the capacity and flexibility of the O11D Mini, you can expand your creativity and water-cooling potential inside its compact frame. Decide how many expansion slots you need. Calculate the size of your fans & accessories. Pick your motherboard type. The 30mm space behind the side fan / radiator bracket allows users to mount fans, thus efficiently intake fresh air to directly cool the radiator and leaves enough space to install long GPUs in this compact case. Friendly to custom water cooling users, the three different pump stands included can accommodate different scenarios.