Crucial 8GB Kit (4GBx2) DDR3/DDR3L 1600 MT/s (PC3-12800) CL11 SODIMM 204-Pin 1.35V/1.5V Memory For Mac CT2K4G3S160BM Size: 8GB KIT (4GBx2) PC, Personal Computer Increases system performance Compatible with Mac systems Every single module extensively tested at the component and module level for functionality Meets or exceeds Apple's own quality requirements Easy installation