Can the Late 2009 27" iMac handle 32GB of RAM? | MacRumors Forums
Timetec Hynix IC 16GB KIT(2x8GB) Compatible for Apple DDR3 PC3-8500 1067MHz/1066MHz Upgrade for MacBook 13'' Mid 2010, MacBook Pro 13'' Mid 2010, iMac 27''Late 2009, Mac Mini Mid 2010(16GB KIT(2x8GB)) - Newegg.com
iMac 21.5 Inch 3.06GHz Intel Core i3 Mid-2010 MC508LL/A
iMac 27" 3.2GHz (Mid 2010) | mac of all trades
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
How to Upgrade Memory in a 21.5-inch or 27-inch iMac (Mid 2010) - YouTube