4U, 668W Platinum Level High Efficiency Power Supply, 5x SAS3 3.5" HDD Bays, 3x 5.25" Peripheral Drive Bays, 1x Slim DVD-ROM Drive Bay, 5.7x Full-height, Full-length Tool-less Expansion SlotsDual channel Air Duct design, 2x Front USB 3.0 Ports & 1x Com port, Optional Front Bezel with Removable Air Filter, Power Switch, Reset Switch & 6x LED Indicators