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For iMac 27" A1312 Mid 2009 2010 2011 upgrade NVIDIA K3100M 4GB GPU Video Card | eBay
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Someone gave me this unwanted Mac, anyone know if you can upgrade the graphics cards on these ? Keep seeing conflicting information it's a 24" early 2009 imac : r/mac
ssd - What are my hardware upgrade options for a late 2009 iMac? - Ask Different
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Late 2009 iMac Ram/Vram Please Help - Apple Community