2U 13.68"" x 13"", 12 x 3.5"" hot-swap SAS/SATA drive bay with SES3, optional 2 x 2.5"" hot-swap drive bay, 12-port 2U SAS3 12Gbps single-expander backplane, support up to 12x 3.5-inch SAS3/SATA3 HDD/SSD, 920W Redundant Platinum, 7 low-profile expansion slot(s), 3 x 8cm high-performance PWM fan(s)