- 2U chassis support for SMC Proprietary WIO motherboards max. motherboard size - 12" x 13", 13" x 13.68". Support up to 12"x13" MB with rear 2.5" HDD option installed - 12 x 3.5" hot-swap drive bay, optional 2 x 2.5" hot-swap drive bay - 12-port 2U SAS3 12Gbps hybrid backplane, support up to 8x 3.5-inch SAS3/SATA3 HDD/SSD and 4x SAS3/SATA3/NVMe Storage Devices - 1U 920W Redundant Platinum Super Quiet power supply W/PMbus - WIO Slots (4x Full-height, Half-length + 3x Low-profile) - 3 x 8cm high-performance PWM fan(s) - Optional 5 x 6cm 4pin high performance fan(s)