iMac 2009 / 2010 / 2011 GPU upgrade — Fixing LED/LCD PWM brightness with an ESP32 | by Fixing Things | Medium
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How to Upgrade/Replace GPU Graphics Card on Mid-2011 21.5" iMac - YouTube
2011 iMac GPU Upgrade Now with Brightness and Boot menu - Absolutely Worth It! - YouTube
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Cracking Open the 27" Apple iMac (2011) | TechRepublic
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