Case Type Mini Tower Motherboard Type Micro ATX Dimension(mm)180(W)x370(H)x420(D) External 5.25" Drive Bays 2 External 3.5" Drive Bay 1 Internal 3.5" Drive Bays 2 Internal 2.5" Drive Bay 1 (at bottom cover)I/O Panel USB3.0 x1 & USB2.0 x1, Mic x1, Audio x1 Cooling System Front 80/90/120mm Fan x1pcs (optional) Rear 80/120mm Fan x1pcs (optional) Left Side 120mm Fans x2pcs (optional) COUGAR 120mm Fan (rear)1 (pre-install) Expansion Slots 4 Maximum Graphics Card Length 330mm Power Supply Standard ATX PS2 (optional)