All Xserve configurations include: two 64-bit Dual-Core Intel Xeon \"Woodcrest\" microprocessors, eight fully buffered DIMM slots, two PCI Express expansion slots, three hard drive bays with support for SATA or SAS Apple Drive Modules, one optical drive, two USB 2.0 ports, two FireWire 800 ports, one FireWire 400 port, dual Gigabit Ethernet ports, one DB9 serial port, one 650W power supply with support for dual redundant power supplies, rack mounting rails, integrated lights-out management hardware with Server Monitor software, and an unlimited-client license of Mac OS X Server.