Refurbished 27-inch iMac 3.6GHz 10-core Intel Core i9 with Retina 5K display - Apple
Late 2009 iMac 27" Video Card Repair — 4850 — 2nd Bake - YouTube
Apple IMAC 27” A1312 Nvidia Quadro K4100M 4GB MXM Video Card GPU Replace 6970M | eBay
Amazon.com: Valley Of The Sun New 2GB Graphics Video Card Upgrade for Apple iMac Mid-2011 27 Inch Core i5 MC814LL/A MC814 A1312 Desktop All-in-One PC, AMD Mobility Radeon HD 6970M Replacement :