Apple Macbook PRO 15" A1286 Intel Core i5-540M Mobile 2.533GHz SLBPF Processor Logic Board 820-2850-A.Apple Part Numbers: 820-2850-ACompatible Part Number: 661-5479CPU: Intel Core i5-540M Mobile 2.533GHz SLBPF ProcessorCompatible Models: Apple Macbook PRO 15" A1286