Corsair mac memory 8gb 1333mhz c9 ddr3 sodimm for apple imac macbook and macbook pro 4gb 2x4gb tested at apples compatibility lab to ensure functionality with all current products that have official apple support for 4gb so dimms adding system memory is one of the most effective ways to improve overall performance and corsairrsquos mac memory offers a solid tested solution with a limited lifetime warranty product features storage capacity8 gb 2 x 4 gb upgrade typesystem specific mac