Upgrade iMac Intel Core i3 CPU to Core i7 - iFixit Repair Guide
iMac 21.5 Inch 3.06GHz Intel Core i3 Mid-2010 MC508LL/A
Apple iMac 27-inch (July 2010) review: Apple iMac 27-inch (July 2010) - CNET
iMac (mid 2010) Core i3 review | Engadget
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 :
Apple iMac 3.6Ghz i5 27-Inch (Mid-2010) – MSU Surplus Store
21″ Apple iMac Desktop (2010) – SmartGiraffe Computer Services
Apple iMac 2.9Ghz i7-870 27-Inch (Mid-2010) *NO HDD/RAM Cracked Screen – MSU Surplus Store