16GB Total. FOUR 4GB PC3-10600 204 pin SODIMM DDR3 1333MHz Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from
CMS MAX MEMORY: 32GB SOCKETS 4
COMPATIBLE WITH: Apple iMac "Core i5" 3.1 27-Inch (Mid-2011) MC814BZ/A