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 :
How to Upgrade the 3.5-inch Main Drive in a 21.5-inch iMac Mid 2010 (Updated) - YouTube
How To Upgrade/Replace Mid-2011 iMac 21.5" Hard Drive To an SSD - YouTube
How to Install a 2.5-inch SSD in the SSD Drive Bay of a 27-inch iMac Mid 2011 (Updated) - YouTube
How to Upgrade iMac Hard Drive or SSD 2012-2022: EveryMac.com