Amazon.com: Original Graphics Video Card GPU Replacement for Apple iMac A1311 Mid-2011 Core i5 2.7 MC812LL/A MC812 21.5 Inch Desktop Computer, AMD Radeon HD 6770M GDDR5 512MB Repair Parts : Electronics
Apple iMac A1311 All in One: Core i5 2400S 2.5GHz 8G 500GB DVDRW 21.5'