iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
SOLVED: What GPU's are compatible with iMac 27" 2011? - iMac Intel 27" EMC 2429 - iFixit
Tarjeta de vídeo para iMac A1312 Mid 2009 2011 NVIDIA GTX 880M 8GB, reemplazo HD6970M 109-C29657-10, 27 pulgadas _ - AliExpress Mobile
Nueva tarjeta gráfica HD 6970M de 2 GB de repuesto para iMac mediados de 2011 de 27 pulgadas All-in-One Desktop PC Core i7 3.4 MD063LL/A MD063, AMD Radeon HD6970M HD6970 GPU Upgrade
2GB Graphics Card GPU Upgrade Replacement for iMac 27 Inch Mid-2011 A1312 Desktop Computer Core i5 3.1 MC814LL/A MC814, AMD Radeon HD 6970M GDDR5 2 GB MXM Video Board Repair Parts :
Apple Initiates Video Card Replacement Program for Radeon HD 6970M Equipped Mid-2011 27” iMacs
NVIDIA tarjeta de vídeo Para iMac A1312, de 27 pulgadas, mediados de 2009 a 2011, GTX 780M, 4GB GDDR5, N14E GTX A2, reemplaza HD 4850, HD 6970M| | - AliExpress