Dell OptiPlex 755 Motherboard CN-0DR845-13740

Number of DIMM Slots: 4
Ports: Serial, USB 2.0, Microphone Jack , Parallel Ports, Headphone, Jack
Number of USB 2.0 Ports: 6
Processor Speed: 2.6 GHz
Processor: Intel Core 2 Duo E6750
Expansion Slots: PCI Express x16, PCI
Graphics: Intel Graphics Media Accelerator X3100