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
Should I upgrade my Intel E7600 CPU for an E8600 in my iMac 27" late 2009? - Ask Different
ram for late 2009 imac model | Newegg.com
How to Upgrade the RAM in Your iMac
iMac Intel 27" Late 2009 EMC 2309 - used original spareparts for Macs