upermicro server chassis 2U chassis supports for maximum motherboard sizes - 13.68" x 13", E-ATX 12" x 13", ATX 12" x 10" motherboards 8 x 3.5" hot-swap SAS3/SATA drive bay, 2 x 3.5" fixed drive bay 8-port 2U SAS3 12Gbps TQ backplane, support up to 8x 3.5-inch SAS3/SATA3 HDD/SSD 1U 800W Redundant Power Supply 76mm width, W/PMbus, Titanium 7 low-profile expansion slot(s) 3 x 80mm Hot-swap PWM Fans