Form Factor 4U chassis for motherboard support size Drive Bays Storage Chassis: 44x 3.5" hot-swap HDD bays for JBOD solutions SAS or enterprise SATA HDD only recommende Backplane E1C: Single SAS3 (12Gbps) expander backplane E2C: Dual SAS3 (12Gbps) expanders backplane System Cooling Fans: 7x 8cm hot-swap redundant PWM cooling fans System Monitoring IPMI Power Supply 1280W Redundant High-efficiency Digital Power Supplies w/PMBus 1.2 Item Dimension (L"xW"xH") 40 x 28 x 21 Weight 142 lb Warranty Information 3 years