The Patriot 8GB (2x 4GB) DDR3 PC3-10600 1333MHz SODIMM Memory Module Kit for Apple computer systems delivers quality, reliability and performance that makes them the perfect memory upgrade solution. Patriot test for compatibility in Apple iMac, MacBook, MacBook Pro and Mac Pro systems. This 8GB kit (2x 4GB) is designed to run at PC3-10600 (1333MHz) at CAS 9 latency timings. Built using specific build-of-materials (BOMs) Patriot ensure that every module meets and exceeds industry standards: offering you a hassle-free upgrade.