1U, support size: (12" x 10") (9.6" x 9.6"), 4 x 3.5" hot-swap SAS/SATA drive bay with SES2, 1U 4-Port 12Gbps Backplane Support 4x3.5, 1U 500W Multi-output power supply w/ PMbus, 80Plus Platinum, 1 full height expansion slot(s), 4 x 40x28mm PWM fan(s)