- 650W High efficiency Redundant DC-DC Power Supplies - 4x 3.5" Hot-swap SAS/SATA Drive Bays - 1x Slim DVD ROM Drive (optional) - 4x Counter-rotating Fans - 1x Full-size, Full-length I/O Expansion Slot - Power Switch, Reset Button & 5 LED Indicators - Full SES2 support is available with SAS motherboards and other compatible components.