Genuine Dell Motherboard For Optiplex GX520 Tower Systems Part Number: WG233, H8052 Chipset: Intel 945 Express Processor: Intel Pentium or Celeron processor, Socket 775 Memory: 2x 400-MHz and 533-MHz DDR2 SDRAM Slots, 4gb Max Total Audio: Integrated AC97, Sound Blaster emulation. Video: Integrated Intel Graphic Media Accelerator 950 Expansion Capabilities: 2x PCI Slots, 1x PCI-E Slot. Peripheral Interfaces: 1x Serial Port, 1x Parallel Port, 1x VGA Monitor Port, 1x 10/100 Ethernet LAN Port, 2x front-panel and 6x back-panel USB 2.0compliant connectors, three connectors for line-in, line-out, and microphone; two front-panel connectors for headphones and microphone