Numerous styles and sizes are available for your MiSTer case. Depending on whether or not you plan to add internal upgrades that may require unknown space, you can get by with a compact case or a worry-free Universal 5.2 case which is wider and taller. The universe case allows the older sideways-mounting SDRAM daughter board but we encourage you to move away from the older boards and focus on an I/O board that has the SDRAM built in. You can then use the compact case.