Genuine Dell Dimension 8400 Motherboard Part Numbers J3492 GH003 CH776 U7077 Intel 925 Express ChipSet; Socket LGA775 Supporting Pentium 4, Celeron, Prescott Processors; Hyper-Threading Technology Support 533/800 MHz system bus; 4 Dual Channel DIMM Support for DDR2-400/533; 4 GB MAX system memory 1 16x PCI-Express Video Slot; Integrated 10/100/1000 Lan; Integrated ADI Sound Four Serial ATA Hard Disk Connectors; One ATA-66/100/133 Hard Disk Connector; One Floppy Connector 3 PCI Card Slots, 1 1X PCI Express; 6 USB 2.0 Ports; 5.1 Surround Sound Audio Ports; 1 Serial/1 Parallel Port; PS2 Mouse and Keyboard Ports