Key Features 2U chassis supports for maximum motherboard sizes - 13.68" x 13.4", E-ATX 12" x 13", ATX 12" x 10" motherboards 16 x 3.5" hot-swap SAS3/SATA drive bay, optional 2 x 2.5" hot-swap SAS/SATA 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 4-port internal SAS3 12Gbps backplane, support up to 4x 3.5-inch SAS3/SATA3 HDD/SSD 1U 800/1000W Redundant Single Output Power Supply Titanium Level, CRPS 203mm length 7 low-profile expansion slot(s) 4 x 80x38mm hot-swap cooling fan(s)