Key Features 4U Chassis for motherboard support size: (12" x 10") (13.68" x 13") (9.6" x 9.6") 36 x 3.5" hot-swap SAS/SATA drive bay with SES3, optional 2 x 2.5" hot-swap drive bay 12-Port 2U Backplane with Expander support up to 8 x 3.5" SAS3/SATA3 HDD/SDD and 4 x SAS3/SATA3/NVMe Storage Devices,HF,RoHS/REACH 24-port 4U SAS3 12Gbps single-expander backplane, support up to 24x 3.5-inch SAS3/SATA3 HDD/SSD 1U 1200W/1000W Titanium Power Supply W/PMbus W76xL336xH40mm 7 low-profile expansion slot(s) 7 x 80mm high-performance fan(s)