Asus UX31E Series Intel Core i5-2557M 1.7GHz SR0CS Processor 4GB Laptop Motherboard 60-N8NMB4F00-A21.Asus Part Number: 60-N8NMB4F00-A21CPU: Intel Core i5-2557M 1.7GHz SR0CS ProcessorCompatible Models: Asus UX31E Series