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Upgrade Options for Apple iMac 27-Inch 2011
Apple iMac 27" with a failed Graphics card is getting surgery today... - Jappel Tech - Tech Support, Apple Certified, Managed Services, URC Total Control
Apple opens graphics card replacement program for some mid-2011 iMacs - 9to5Mac
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
SOLVED: What GPU's are compatible with iMac 27" 2011? - iMac Intel 27" EMC 2429 - iFixit