The inside of the Obsidian 650D is split into two areas. The first, and main section, includes plenty of space for main components such as PSU and motherboard. The second section includes all the drive bays. Throughout the main section we find pre-cut holes which are filled with rubber grommets which are used for cable routing. In terms of motherboard support the Obsidian 650D is compatible with both ATX and mATX models and of course has a large cut-out for CPU cooler back plate installation.
Looking at the bottom left of the case we find the PSU location. The PSU is raised off the bottom of the case by two metal ridges for improved air flow and the PSU location has plenty of room to support longer power supplies, ensuring any future upgrades can be accommodated.
Above the expansion slots there is a single 120mm fan which uses a 3-pin connector then moving to the top left of the main chamber we find a 200mm exhaust fan which uses 3-pin or Molex plug for power. Both the rear and top fans can be plugged into the motherboard or the 650D fan controller.
The Obsidian 650D features four 5.25" optical drive bays, all of which are tool free. Underneath the 5.25" drive bays are six 3.25" drive bays, which are also all tool free. The 3.25" drive bays are split into two three bay sections. Either of these bays can be removed to accommodate a larger graphics cards and SSD drives can be installed into the 3.25" bay using the screws provided by Corsair with the case.