Corsair Vengeance 16GB (2x8GB) DDR3 1600 MHz (PC3 12800) Laptop Memory (CMSX16GX3M2A1600C10) (Personal Computers)
Have this memory, despite the limitation on the part of Apple bought to 8GB total memory, and am very happy with it! Works flawlessly and with Corsair has also simultaneously bought brand memory. Compared to my PC retailers of memory was just under 4