How to Upgrade iMac Hard Drive (2009, 2010, 2011): EveryMac.com
A-Tech 32GB (4 x 8GB) PC3-8500 DDR3 1066/1067 MHz RAM for iMac Late 2009 27- inch (Quad-Core i5/i7) | 204-Pin SODIMM Max Memory Upgrade Kit at Amazon.com
Apple iMac 21.5-inch Late 2009 - 3.06GHz Core 2 Duo Apple RAM Memory | Kingston
Memory Upgrades for Apple iMac 2009 - Up to 32GB
iMac Intel 27" Sustitución RAM EMC 2309 y 2374 - Guía de reparación iFixit