8GB 2 X 4GB DDR3 Memory for Apple MacBook Pro 15" inch 2.2GHz Quad Core Intel Core i7 PC3-10600 204 pin 1333MHz MC723LL/A (Winter 2011) SODIMM RAM (PARTS-QUICK BRAND) Halogen Free; ROHS Speed: PC3 10600 1333MHz Form Factor: 204 pin SODIMM Capacity: 8GB 2X4GB KIT Warranty Lifetime