16GB Total. FOUR 4GB PC3-8500 204 pin SODIMM DDR3 1066MHz CL7 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: 16GB SOCKETS 4
COMPATIBLE WITH: Apple iMac "Core i7" 2.8 27-Inch (Late 2009) Late 2009 - BTO/CTO - iMac11, 1 - A1312 - 2374