Upgrading the graphics in our 2011 iMac (first attempt) - YouTube
Der 2011er iMac und das leidige Thema mit der Grafikkarte – Romans Blog
Amazon.com: 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 : Electronics