CORSAIR Mac Memory, 16GB (2x8GB) 1333MHz C9 DDR3 SODIMM for Apple iMac, MacBook and MacBook Pro. Tested at Apple Developer Compatibility Labs to ensure functionality with all current products that have Intel Core i5 and Core i7 processors. Adding system memory is one of the most effective ways to improve overall performance and Corsair’s Mac Memory offers a solid Apple Mac memory upgrade solution with a limited lifetime warranty.