The Corsair Obsidian 350D has a the Micro-ATX form factor. Micro-ATX is a smaller version of the ATX standard which is designed to make your case and the system therein lightweight and portable. Using the Micro-ATX standard, the case can house motherboards and power supplies with form factors Micro-ATX and Mini-ITX. The dimensions of the case itself (LxWxH) are 440mm x 210mm x 450mm.

The Corsair Obsidian 350D has five expansion slots, so there is some room for extra components, which may be a deciding factor when planning on the longevity and build type of a PC system. The case has two 5.25" drive bays, which There are no 5.25" drive bays, but there are two 3.5" drive bays, which is quite a small amount of space, although you can install an SSD or laptop hard drive in one of the three 2.5" drive bays. Installation of hard drives into these drive bays is made all the more easier by screwless rails that allow tool-less mounting.

Made primarily of Aluminium, the Corsair Obsidian 350D is built to be strong, lightweight, and well-ventilated. This often comes at a price premium, but some see the benefits to be completely worth it. Whatever your case's material, it is important to keep a consistent airflow so that heat doesn't build up inside. It is therefore advised that you make use of the available built-in case fans and fan installation sections.