For iMac 27" A1312 Mid 2009 2010 2011 upgrade NVIDIA GTX 780M 4GB Video Card | eBay
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iMac 2011 GPU upgrade to NVIDIA 770M with new VBIOS - YouTube
Imac A1312 Video Graphics Card | Apple Imac A1312 Graphics Card - K3100m Gddr5 4gb - Aliexpress
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Amazon.com: Valley Of The Sun New 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 :
Today picked up a $20 2011 iMac 27” with working gpu too! : r/mac
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Amazon.com: 2GB Graphics Card GPU Upgrade Replacement for iMac 27 Inch Mid- 2011 A1312 Desktop Computer Core i5 3.1 MC814LL/A MC814, AMD Radeon HD 6970M GDDR5 2 GB MXM Video Board Repair Parts :