iMac 27" A1419 Late 2012 Logic Board W/Nvidia GTX 680MX 2 GB Video Card *No CPU* | eBay
Amazon.com: 2 GB Graphics Video Card GPU Upgrade Replacement for Apple iMac Mid-2011 A1312 27 Inch Core i7 3.4 i5 3.1 Desktop Computer, New AMD Radeon HD 6970M HD6970M 2GB MXM Board
Amazon.com: Valley Of The Sun 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 Repair Parts :
Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
Autopsy shows 27-inch iMac is positively austere on the inside | Ars Technica
Where is my iMac A1419 SSD? - Ask Different
iMac Intel 27" EMC 2374, AMD Radeon HD 4850 Video Card Removal & Repair - iFixit Repair Guide
How to Install an SSD Card into a 21.5-inch iMac (Late 2012–Early 2013) iMac13,1 - YouTube