Adding an external GPU to your Mac is probably a better upgrade option than getting a new one | TechCrunch
Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube
GPU Kuehler 730-0483 mit Sensor iMac 24 Zoll A1225 2007 2008 Original fuer NVidia 8800 GS 512 MB - gebrauchte Originalersatzteile für Macs
Editorial: Mac Pro puts the pedal to Metal in Apple's race with Nvidia | AppleInsider
How to Use NVIDIA Cards with your Mac eGPU (Easiest Method) - YouTube
Mac OS VM Guide Part 2 (GPU Passthrough and Tweaks) - The Passthrough POST
Für iMac 27 "A1312 Mid 2009 2010 2011 6970m 1GB 2GB 109 C29657 10 Upgrade Für Nvidia GTX 770 GDDR5 3GB MXM TYPE B VIDEO GPU KARTE|null| - AliExpress
Original Grafikkarte GPU Ersatz für Apple iMac Ende 2009 68,6 cm Core i5 2.66 MB953LL/A A1312 All-in-One Desktop PC, AMD ATI Mobility Radeon HD 4850 GDDR3 512 MB, MXM VGA Board Repair
Für iMac 27 "A1312 Mid 2009 2010 2011 6970m 1GB 2GB 109 C29657 10 Upgrade Für Nvidia K3100M GDDR5 4GB MXM TYPE B VIDEO GPU KARTE|null| - AliExpress