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Tarjeta gráfica Original HD4670 para iMac, 4850, 5750, 6970, 21,5 ", 27", A1311, A1312, GPU, 2009, 2010, 2011 años - AliExpress
Tarjeta gráfica Original Ati HD 6970M, 5750, 4850, 4670, 1GB, 2GB, 109-C29657-10, para Apple iMac de 27 pulgadas, A1312, GPU 2009, 2010, 2011 - AliExpress
Amazon.com: Original Graphics Video Card for Apple iMac 2011 Core i5 2.7 A1312 MC813LL/A MC813 27 Inch Desktop PC Computer AMD Radeon HD 6770M HD6770M GDDR5 512MB 109-C29557-00 Replacement Parts : Electronics
How to Upgrade/Replace GPU Graphics Card on Mid-2011 21.5" iMac - YouTube