HoTecHon Modded Big 3 Pipe GPU Heatsink for iMac 27" Mid 2010 / 2011 Graphics Upgrade Gadgets - Newegg.com
Amazon.com: 2GB Graphics Video Card Replacement for Apple iMac Mid-2011 27 Inch A1312 Core i7 3.4 MD063LL/A MD063 Desktop PC Computer, ATI Radeon HD 6970 GDDR5 2 GB, New GPU Upgrade Repair
Shop Imac Video Card Replacement | UP TO 51% OFF
SOLVED: What GPU's are compatible with iMac 27" 2011? - iMac Intel 27" EMC 2429 - iFixit
Apple IMAC 27” A1312 Nvidia Quadro K5000M 4GB MXM Video Card GPU Replace 6970M | eBay
Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
iMac Late 2009 21.5" GPU upgrade - Apple Community