Genuine Dell WJ770 JC474 Motherboard For The Dell Dimension 3100/E310 Systems Genuine Dell MotherBoard For the Dell Dimension 3100/E310. Part Number WJ770 / JC474. Socket LGA775, Intel 915GV, Hyper-Threading Technology Support 2 Dual Channel DIMM Support for DDR2, 2 GB MAX system memory, 2 PCI Slots 1 PCIe x 1, Integrated 10/100 Lan, Onboard Sound, 2 Serial ATA Hard Disk Connectors 1 ATA-66/100/133 IDE Hard Disk Connector, One Floppy Connector, 4+2 USB 2.0 Ports