DELL XG309 LGA 775 Intel 945G Optiplex GX520 Small Form Factor Motherboard Memory Standard: DDR2 Max LAN Speed: 10/100/1000Mbps Maximum Memory Supported: 4GB Channel Supported: Dual Channel PCI Slots: 1 x PCI Slot USB 1.1/2.0: 6 x USB 2.0 Other Connectors: Peripheral Interface: (1) Serial ATA (SATA) Interface Other: One IDE Channel Supporting ATA-66/100/133 and One Floppy Port