Motherboard Compatibility: 12" x 13" E-ATX, 12" x 10" ATX, and 9.6" x 9.6" Micro-ATX Power Supply: 500W AC power supply w/ PFC External 5.25" Drive Bays: 2 External 3.5" Drive Bays: 1 Internal 3.5" Drive Bays: 4 x 3.5" SAS/SATA Expansion Slots: 7 Front Ports: 2 x Front USB 2.0 ports 2 x Front HD/AC97 Audio ports 120mm Fans: 1