Mini ITX without Compromise If you want to build a Mini ITX system without sacrificing expansion, flexibility, or performance, the Obsidian Series 250D is your answer. Though it's small on the outside, the 250D has room for standard components like a full-size 5.25"" optical drive, a full-length GPU, a 240mm radiator, and even a full-size ATX power supply. The sleek aluminum front fascia provides the striking yet subtle design that Obsidian Series cases are known for, and a top window gives you a close-up view of your high-performance components. The 250D is a great choice if you want full size performance in a small space.