LIAN-LI PC61 ATX ALUMI. MID TOWER 4 3 (5) DRIVE BAYS F.USB2.02 4FAN WO PS 80mm Fans: 1 x 80mm rear fan 1 x 80mm top fan 2 x 80mm front fan Expansion Slots: 7 External 3.5" Drive Bays: 3; External 5.25" Drive Bays: 4 Motherboard Compatibility: ATX Internal 3.5" Drive Bays: 5