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Apple iMac A1311 A1312 2009 2010 2011 NVIDIA K1100M K2100M 2GB Video Card GPU | eBay
For Apple iMac 21.5" A1311 Mid/Late 2009 2010 2011 NVIDIA K2100M 2GB Video Card | eBay
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Big Sur on iMac 27", Mid 2011, flashed 4GB NVIDIA Quadro K4100M by Nikey22, having issues with screen brightness, any ideas? Brightness control was working with Catalina Patcher, after installing Big Sur