How to upgrade RAM / Memory on a 2010 iMac Core i3 i5 i7 (21.5in & 27in) - YouTube
iMac Core I7 Review (Mid 2010) - SlashGear
Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade :
iMac Core I7 Review (Mid 2010) - SlashGear
Install memory in an iMac - Apple Support
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Can you upgrade the RAM in the 27-inch iMac? | iMore
Apple iMac (27-inch, Mid 2010) Serial Number Lookup - AppleSN.info
Install memory in an iMac - Apple Support
Apple iMac 27" - Mid 2010 Reviews, Pros and Cons | TechSpot
iMac Mid-2010 27 inch (A1312) SSD and RAM disassembly and upgrade - Much FASTER! - YouTube