8GB 2 X 4GB Memory for HP EliteBook 2540p 2740p 8440p 8540p Notebook Laptop DDR3 PC3-10600 1333MHz 204 pin SODIMM RAM (PARTS-QUICK BRAND) Halogen Free; ROHS Speed: PC3-10600 DDR3 1333MHz Form Factor: 204 pin SODIMM Capacity: 8GB 2 x 4GB Kit Warranty: Lifetime