Apple iMac 2010 21.5” Intel i5 3.60GHz 4GB RAM 2TB HD ATI 512 MB, Office, I Life | eBay
Apple iMac 21.5" - Early 2010 Reviews, Pros and Cons | TechSpot
APPLE IMAC 2010, ALL-IN-ONE, 21″ inch Full HD , CORE 2 DUO, 2.26GHZ, R – Montag Store
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book, Mac Book Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) SODIMM Memory MAC RAM Upgrade
How to upgrade RAM / Memory on a 2010 iMac Core i3 i5 i7 (21.5in & 27in) - YouTube