Quadro K610M 1GB K1000M K1100M K2000M K2100M 2GB Video Graphics Card With X-Bracket For iMac A1311 A1312 2009 2010 2011 year - AliExpress
For iMac A1312 A1311 2009 2010 2011 NVIDIA Quadro K2100M 2GB Video Card | eBay
2011 iMac 27″ K1100M Graphics Card Swap And Install Catalina
2011 iMac 27″ K1100M Graphics Card Swap And Install Catalina
2011 iMac GPU Upgrade Now with Brightness and Boot menu - Absolutely Worth It! - YouTube
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 :
iMac 2009 / 2010 / 2011 GPU upgrade — Fixing LED/LCD PWM brightness with an ESP32 | by Fixing Things | Medium