Full Details on Amazon.com : http://www.amazon.com/gp/product/B004TM7UFS?tag=tsukuyomi-20Apple Memory Module 4GB 1333MHz DDR3 (PC3-10600) - 2x2GB SO-DIMMs4 GB Kit 2 x 2 GB DDR3 1333 PC3 10600 204-PIN SODIMM Apple Memory MC703GA