ATX mid-towerExplanationYou should purchase an ATX mid-tower case. ATX mid-tower cases are compatible with the most motherboard form factors and typically have at least two external bays. Most ATX full-tower cases are not compatible with Mini-ITX motherboards and are larger than necessary for most applications. Micro-ATX towers are only compatible with microATX and Mini-ITX form factors. Mini-ITX towers are only compatible with the Mini-ITX form factor.