2010 iMac CPU Upgrade - The whole process - YouTube
Apple iMac 27” Mid 2011 A1312 Logic Board 820-2828-A + i-5 2400 3.1GHz WITH CPU | eBay
27" iMac A1312 MC813LL/A Mid 2011 Logic Board 820-2828 639-2289 CPU NO - Part Haven
iMac Repair & Upgrade, Same Day Services
2 GB Graphics Video Card GPU Upgrade Replacement for Apple iMac Mid-2011 A1312 27 Inch Core i7 3.4 i5 3.1 Desktop Computer, New AMD Radeon HD 6970M HD6970M 2GB MXM Board Repair Parts
HOW TO: Upgrade The CPU from an Intel Core i5 to an Intel Core i7 on a Mid- 2011 21.5inch iMac - YouTube
Apple iMac Upgrades | SimplyFixIt
2 GB Graphics Video Card GPU Upgrade Replacement for Apple iMac Mid-2011 A1312 27 Inch Core i7 3.4 i5 3.1 Desktop Computer, New AMD Radeon HD 6970M HD6970M 2GB MXM Board Repair Parts
Apple iMac 27 inch A1312 2011 Socket LGA1155 Logic Board Motherboard 639-2188 | eBay
hard drive - Yet Another "Will This CPU Work?" - Mid 2011 iMac 27" Upgrade - Ask Different
Upgrade iMac Intel Core i3 CPU to Core i7 - iFixit Repair Guide
Upgrade processor iMac (mid 2010 specifically) - Ask Different
Upgrade iMac Intel Core i3 CPU to Core i7 - iFixit Repair Guide
Upgrade iMac Intel Core i3 CPU to Core i7 - iFixit Repair Guide