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How to upgrade a Mac: Swap in new RAM, graphics card, hard drive and more | Macworld
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iMac 2010 GPU in 2011 | MacRumors Forums
2011 iMac 27″ GPU failure Fix/Upgrade – JCYCLE
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Newest iMacs have removable GPU, ambient light sensor | Ars Technica
hardware - Is it possible to replace the GPU in this 2006 iMac? - Ask Different
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