HOW TO: Upgrade The CPU from an Intel Core i5 to an Intel Core i7 on a Mid-2011 21.5inch iMac - YouTube
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
Amazon.com: Valley Of The Sun 2GB Graphics Video Card Upgrade for Apple iMac Mid-2011 27 Inch Core i5 MC814LL/A MC814 A1312 Desktop All-in-One PC, AMD Mobility Radeon HD 6970M Replacement Repair Parts :
Upgrade iMac Intel Core i3 CPU to Core i7 - iFixit Repair Guide
Upgrade iMac Intel Core i3 CPU to Core i7 - iFixit Repair Guide
2011 iMac 21.5” CPU Upgrade Full Tutorial! - YouTube
Upgrade iMac Intel Core i3 CPU to Core i7 - iFixit Repair Guide
Picked up this iMac (27", mid 2011) i7 @ 3.4GHz , 16 gb ram , 256 SSD in excellent condition for $210. Should I make any upgrades ? GPU, bigger SSD? Thanks : r/LukeMianiYouTube
Apple iMac review (mid 2011) - The Verge
hard drive - Yet Another "Will This CPU Work?" - Mid 2011 iMac 27" Upgrade - Ask Different
Amazon.com: Valley Of The Sun 2GB Graphics Video Card Upgrade for Apple iMac Mid-2011 27 Inch Core i5 MC814LL/A MC814 A1312 Desktop All-in-One PC, AMD Mobility Radeon HD 6970M Replacement Repair Parts :
21.5 iMac Mid 2011 12,1 A1311 820-3126 Logic Board Core I5 "CPU Not In - Part Haven