The Corsair Obsidian Series 550D has been carefully engineered for noise reduction. The front & side panels are insulated with sound dampening material,  & the hard drive trays & fans have soft silicon mounts to absorb vibration. The top & side panel vents are covered for noise reduction if you’re not using them to install your own fans,  & even the intakes are angled to reduce air noise. The rigid,  stamped steel & brushed aluminum case holds some remarkable technology that makes it easy to build great systems. There’s built-in USB (Universal Serial Bus) 3.0 support,  & the drive trays work with 2.5” SSDs. The removable hard drive bays allow customization for extra-long graphics cards & maximizing airflow. &,  the easy-access side panels come off at the touch of a button for easy upgrades or simply admiring your work. 
 Features:
- Insulated,  sound dampened side & front panels
- Six tool-free hard drive trays with integral SSD support & soft silicon sound dampening
- Four tool-free optical drive bays
- Angled air intakes for reduced noise
- Covered vents for noise reduction if additional fans (not included) are not installed
- Front panel USB (Universal Serial Bus) 3.0 connectors & audio connectors
- Cable routing cutouts with rubber grommets
- Removable,  reversible front panel
- One-button side panel removal for quick access
- Matte black interior
- Three 120mm fans
- Top panel is compatible with 240mm radiators for dual-radiator Hydro Series CPU coolers & liquid cooling systems
- Eight expansion slots for multi-GPU compatibility Specifications: Dimensions: 20.9” x 8.7” x 19.5” 
 Material: Brushed aluminum with steel structure 
 Colour: Black Model: CC-9011015-WW Drive Bays (x 4) 5.25” (x 6) 3.5”/2.5” Drive Caddies Cooling (x 2) 120mm Intake fans (x 1) 120mm Exhaust Fan Expansion Slots 8 Motherboard ATX,  m ATX Front I/O (x 2) USB (Universal Serial Bus) 3.0 (x 1) IEEE 1394 Firewire (x 1) Headphone,  (x 1) Mic Power Supply ATX (not included)