The SC743T-645 black 4U Chassis supports a 12" x 13" (max. size) E-ATX motherboard and dual Xeon 800MHz FSB processors. For expansion, it includes six PCI slots, eight 1" SATA Hot-swap drive bays, two 5.25" peripheral drive bays, one 5.25" bay for a floppy drive and two USB ports. Other features include a SATA hard drive backplane, six LEDs and a Chassis intrusion switch. It comes with a 645W low-noise AC power supply with PFC.