8GB total memory upgrade 2pcs of 4gb sodimm PC1333 204pin 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