Amazon.com: Valley Of The Sun Original Graphics Video Card GPU Upgrade Replacement for Apple iMac 21.5 Inch Late 2011 Core i3 3.1 All-in-One Desktop PC MC978LL/A, AMD ATI Mobility Radeon HD 6750M,
iMac 2011 GPU upgrade to NVIDIA 770M with new VBIOS - YouTube
Upgrading the GPU in the 2011 iMac - is it worth it? - YouTube
I recently purchased 2011 21.5 iMac (Mid-2011) and I'm obsessed. : r/mac