8GB Total. Two 4GB PC3-10600S 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 27-inch 3.4GHz Intel Core i7 Apple iMac 27-inch 2.7GHz Intel Core i5 (MC813LL/A) Apple iMac 21.5-inch 2.7GHz Intel Core i5 (MC812LL/A) Apple iMac 21.5-inch 2.8GHz Intel Core i7 Apple iMac 27-inch 3.1GHz Intel Core i5 (MC814LL/A) Special Comments: Apple officially supports 16GB of RAM in this model. The actual maximum RAM be higher that what Apple formally supports this will be updated.
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