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mid-2011 iMac 27 graphics issue: Mac Talk Forum: Digital Photography Review
iMac 2009 / 2010 / 2011 GPU upgrade — Fixing LED/LCD PWM brightness with an ESP32 | by Fixing Things | Medium
SOLVED: What GPU's are compatible with iMac 27" 2011? - iMac Intel 27" EMC 2429 - iFixit
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Imac Mid 2011 GPU Fix | MacRumors Forums
iMac 27" A1312 Mid 2011 Video Card AMD Radeon HD 6770M 512MB 730-0630-A 661-5967 | eBay
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A1312 iMac GPU Replacement - YouTube
Upgrading the graphics in our 2011 iMac (first attempt) - YouTube
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 :
For iMac 27" A1312 Mid 2009 2010 2011 upgrade NVIDIA GTX 880M 8GB Video Card | eBay
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How to Upgrade/Replace GPU Graphics Card on Mid-2011 21.5" iMac - YouTube