Amazon.com: Original 2GB Graphics Video Card Upgrade Replacement for Apple iMac Mid-2011 27 Inch A1312 Core i7 3.4 MD063LL/A MD063 Desktop PC Computer, AMD ATI Radeon HD 6970 Spare Parts Full Tested :
Apple opens graphics card replacement program for some mid-2011 iMacs - 9to5Mac
iMac mid 2011 GPU upgrade | MacRumors Forums
SOLVED: What GPU's are compatible with iMac 27" 2011? - iMac Intel 27" EMC 2429 - iFixit
A1312 iMac GPU Replacement - YouTube
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
SOLVED: What GPU's are compatible with iMac 27" 2011? - iMac Intel 27" EMC 2429 - iFixit