Supermicro Mid Tower CSE-732D4-500B Form Factor: Mid-Tower chassis support for motherboard sizes 12-Inch x 13-Inch E-ATX, 12-Inch x 10-Inch ATX and 9.6-Inch x 9.6-Inch Micro-ATX Expansion Slots: 7x Full-height, Full-length I/O expansion slots Power Supply: 500W AC power supply with PFC Certification: 80 PLUS Gold Certified Internal Drive Bays: 4x 3.5-Inch SAS/SATA HDD Bays, SAS or enterprise SATA HDD only recommended