Genuine Dell GM819 JR271 Y255C GM816 Optiplex 755 Small Mini Tower SMT Socket755 Intel Logic Main System Board Motherboard Compatible Part Numbers: GM819, JR271, Y255C, GM816 Genuine Dell MotherBoard For Dell Optiplex 755 SMT Small Mini Tower CHIPSET:Intel Q35 Express w/ ICH9D0 | SUPPORTED PROCESSOR: Intel Pentium, Celeron, Core 2 Duo, Core 2 Quad, Socket 775 MEMORY: 4 DIMM slots supporting up to: 8 GB of RAM for 64-bit OS, or 4 GB of RAM for 32-bit OS | VIDEO: Integrated Graphics Media Accelerator 3000 | AUDIO: Integrated Audio Sound Controller, ADI 1984 High Definition Audio PERIPHERAL INTERFACES: (8) 2.0 USB (front and back), (1) parallel printer port, (1) serial ports, 4 - Serial ATA (SATA) Interface Ports, 1 - e-Serial ATA (eSATA) Interface Port, 1- 10/100/1000 Ethernet Port EXPANSION CAPABILITY:1 PCI-E X16 slot, supports x16, x8, x4, and x1 modes/cards, 1 PCI-E x1 slot, 2 PCI 32Bit / 33MHz slots, 1 FDD connector, Dell Part Numbers : GM819, JR271, Y255C, GM816