Let's reflow! (The issue is not the solder, it's the glue holding the GPU die on) : r/mac
Apple iMac Graphics Card Repair, Replace Chipset (not BGA Reballing or Reflow) | eBay
iMac late 2012 GPU issue - reflow possible? : r/mac
Challenges Of Affordable Reflow – Whizoo Electronics
2011 iMac 27″ GPU failure Fix/Upgrade – JCYCLE
iMac Graphics Card GPU Overheating and Failure
Amazon.com: Valley Of The Sun 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 Repair Parts :
Vlog - DIY 'oven reflow' repair on AMD 6970m GPU for 2011 27" Apple iMac A1312 - YouTube
2010 iMac GPU reflow repair - YouTube
How to Bake a Failing Graphics Processor to Possibly Live Another Day - DreamLight.com
Apple iMac Graphics Card Repair, Replace Chipset (not BGA Reballing or Reflow) | eBay
Hell freezes over: You can now upgrade your Mac at home | ZDNET
Amazon.com: Valley Of The Sun 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 Repair Parts :
MacBook Pro 2011 Graphics Fault - A Possible Fix? [Update : Apple Repaired] - MacAmbulance : Affordable Apple Mac & Windows Support and Web Development for Brighton & Sussex
iMac Intel 27" EMC 2374, AMD Radeon HD 4850 Video Card Removal & Repair - iFixit Repair Guide
Reflow on HD6750M graphics card | MacRumors Forums