- 2U chassis - supports for maximum motherboard sizes: 13.68" x 13"; E-ATX 12" x 13", ATX 12" x 10". Support up to 12" x 13" MB with rear 2.5" HDD option installed - 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 - 1U 920W Redundant Platinum Super Quiet power supply W/PMbus - WIO Slots (4x Full-height, Full-length + 3x Low-profile) - 3 x 8cm high-performance PWM fan(s)