ATI Radeon HD Graphics Card - iMac 27" End of 2009 - MacManiack England
Failing To Max Out A Late 2009 27" iMac (Failed GPU Upgrade Attempt) - YouTube
Original Graphics Video Card for Apple iMac Core i7 2.8 27-Inch Late 2009 A1412 MC507LL/A MC507 Desktop Computer, AMD ATI Mobility Radeon HD 4850 GDDR3 512MB 109-B91157-00, GPU Upgrade Replacement : Electronics - Amazon.com
macos - iMac 27'' late 2009 with GPU problems gets fixed by reinstalling Mac OS, what can be really happening? - Ask Different
Successfully baked iMac 27” late 2009 graphics card, ask me anything! (Yes I feel empowered lol) : r/mac
Today picked up a $20 2011 iMac 27” with working gpu too! : r/mac
Recently acquired 2007 Intel iMac (A1224), I am looking for GPU upgrade options but i can't find a list of compatible ones. Can anyone help me out on finding an either common