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iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
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Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube
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For iMac 27" A1312 Mid 2009 2010 2011 6970m 1GB 2GB 109-C29657-10 Upgrade For Nvidia GTX 780M DDR5 4GB MXM TYPE-B VIDEO GPU CARD _ - AliExpress Mobile
Amazon.com: Original Graphics Video Card for Apple iMac Core i7 2.8 27-Inch Late 2009 A1412 MC507LL/A MC507 Desktop Computer, AMD ATI Mobility Radeon HD 4850 GDDR3 512MB 109-B91157-00, GPU Upgrade Replacement : Electronics