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Amazon.com: Original Graphics Card GPU Replacement, for Apple iMac Late 2009 A1312 MC507LL/A 27-Inch Core i7 2.8 27-Inch Computer, AMD Radeon HD4850 HD 4850 GDDR3 512MB, MXM GPU Video Board Repair Parts :
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Late 2009 iMac 27" Video Card Repair — 4850 — 2nd Bake - YouTube
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iMac 2009 / 2010 / 2011 GPU upgrade — Fixing LED/LCD PWM brightness with an ESP32 | by Fixing Things | Medium
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iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
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Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube