1600mhz ddr3 memory module for apple imac macbook macbook pro imac and mac mini tested at apples compatibility lab to ensure functionality with all mid 2011 and new systems adding system memory is one of the most effective ways to improve overall performance and corsairs mac memory offers a solid tested solution with a limited lifetime warranty specification memory 16gb 2 x 8gb memory type ddr3 memory speed 1600 mhz ecc no form factor 240 pin dimm cas latency 11 11 11 30 voltage