Dell OptiPlex GX520 Intel 945G Motherboard XG312 X7841 MD573 Combo w/CPU & RAM Genuine Dell Motherboard For Optiplex GX520 Desktop Systems Chipset: Intel 945G Express; Processor: Socket 775, Hyper-Threading Technology Support, Intel Pentium 4, Memory: 2x 400/533 MHz DDR2 SDRAM, 4 GB Max Total; Audio: Integrated; Video: Integrated; Expansion Capabilities: 1x PCI, 1x PCI Express;