Dell OptiPlex 3011 Series Intel Socket LGA1155 All-In-One Desktop System Motherboard C1GJ7 0C1GJ7 CN-0C1GJ7.Dell Part Number: C1GJ7 0C1GJ7 CN-0C1GJ7Compatible Part Numbers: 12064-1 48.3KD03.011Compatible Models: Dell OptiPlex 3011 Series