A-Tech 16GB (2 x 8GB) PC3-8500 DDR3 1066/1067 MHz RAM for MacBook (Mid 2010 13 inch), MacBook Pro (Mid 2010 13 inch), iMac (Late 2009 27 inch i5/i7), Mac Mini (Mid 2010)
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Max Memory Upgrade at Amazon.com
Apple iMac (27-inch, Late 2009) Serial Number Lookup - AppleSN.info