4U, 1200W Platinum Level Certified High-Efficiency Power Supply, Micro ATX 24,4 cm ( 9,6 inch ) x 24,4 cm ( 9,6 inch ), E. ATX 30,5 cm ( 12 inch ) x 33 cm ( 13 inch ), 5x SAS3 8,9 cm ( 3,5 inch ) HDD Bays, 3x 13,3 cm ( 5,2 inch ) Peripheral Drive Bays, 1x Slim DVD-ROM Drive Bay, 5.7x Full-height, Full-length Tool-less Expansion SlotsDual