In this guide, we’ll cover the differences between a full, mid, and mini tower gaming PC, as well as how to choose which one is right for you. The maximum motherboard size for a mini tower case is microATX, which is generally between 9. The maximum motherboard size that can fit inside a mid tower case is ATX. Finally, the maximum motherboard size you can fit into a full tower case is EATX or extended ATX. If you enjoy going to LAN parties and playing with your friends, then a mini tower gaming PC would be the right choice for you.