Apple iMac A1312 A1311 2009 2010 2011 NVIDIA Quadro K2100M 2GB Video Card GPU | eBay
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
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen