RAM upgrade considerations for iMac systems - CNET
iMac with Retina 5K Display 2014/2015 Memory Upgrades
How to Upgrade RAM on MacBook Pro, iMac & More | AVG
How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac
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
How to Upgrade the RAM in Your iMac
Apple iMac 2010 Memory 4GB DDR3 1333MHz PC3-10600 204-Pin