Fractal Design Define S Black Silent ATX Midtower Computer Case Motherboard Compatibility: Micro ATX / ATX / Mini-ITX Front Ports: 2 x USB 3.0 / Audio 120mm Fans: Front 3 – 120/140 mm fans (included is 1 Fractal Design Dynamic GP14 fan, 1200 RPM speed) Rear 1 – 120/140 mm fan (included is 1 Fractal Design Dynamic GP14 fan, 1200 RPM speed) Top 3 - 120/140 mm fan (not included) or 1 - 180 mm fan with 165mm hole spacing (not included) Bottom 1 – 120/140 mm fan (not included) Side (Non-window version only) 1 – 120/140 mm fan (not included) Internal 3.5 Drive Bays: 3 - 3.5 HDD positions (can also accommodate 2.5 units) Internal 2.5 Drive Bays: 2 - 2.5 dedicated SSD unit positions Expansion Slots: 7