Dell Optiplex GX280 SDT Motherboard - G8310 Chipset: Intel 915G Express, Processor: Socket mPGA775 533/800Mhz, Intel Pentium D, Intel Pentium 4, Intel Celeron Memory: 4x 400 & 533 MHz DDR2 SDRAM, 4 GB Max Total, Audio: AC97, Sound Blaster Emulation Video: Integrated Intel GMA 900, Expansion Capabilities: 1x PCI Express x16 Video Slot, 1x PCI Slot Drive Bays: 1x 3.5-inch drive (external), 1x bay for CD/DVD or option 2nd HDD (external), 1x bay for 1-inch HDD (internal), Peripheral Interfaces: 1x SATA Connector, 1x VGA Monitor Connector, 1x Serial Connector, 1x Parallel Connector, 1x RJ45 Ethernet/LAN Port, 6x back-panel USB 2.0-compliant connectors, 3x back panel audio connectors Motherboard Compatible Part Numbers: F7739, G7346, DG396, CG815, G8310, U9084, DG389, XC685, X6483, G8310, W5864, N4846