Dell 0KG317 Optiplex 745 USFF Motherboard - Chipset: Intel Q965 Express - Supported Processor: Intel Pentium 4 Pentium D Celeron Core processor -Socket LGA775 - Supported Memory: 533 or 667 MHz DDR2 SDRAM Slots4GB Max Total - Peripheral Interfaces:1 - Serial Port, 1 - Parallel Port, 1 - DVI Port, 1 - DA-2 Adapter Port, 1 - 10/100 Ethernet LAN Port, 7 - USB 2.0 Compliant Ports (5 back panel, 2 front panel USB ports), 2 - Back Panel Connectors for line-in, line-out, and microphone, 2 Front Panel Connectors for Headphones and Microphone