iMac 2010 GPU into 2011 model - iMac Intel 21.5" EMC 2428 - iFixit
Nvidia's Performance Improvement per Gen has dropped from 70% to 30% since 2010
Best graphics cards for money: September 2010 | VideoCardz.com
Amazon.com: Graphics Video Card GPU Replacement for Apple iMac Mid-2010 A1312 Core i5 3.6 MC510LL/A MC511LL/A 27 Inch 27" Desktop PC Computer, ATI Mobility Radeon HD 5670 GDDR3 512MB Genuine Parts :
For iMac 27" A1312 Mid 2009 2010 2011 upgrade NVIDIA K4100M 4GB GPU Video Card | eBay
iMac Intel 27" EMC 2390 Radeon HD 5750 Graphics Card
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Best graphics cards for money: September 2010 | VideoCardz.com
The Best Hardware of 2010 | bit-tech.net
The Best Hardware of 2010 | bit-tech.net
Amazon.com: Valley Of The Sun Graphics Video Card GPU Replacement for Apple iMac Mid-2010 A1311 Core i3 3.06 MC508LL/A MC508 21.5 Inch Desktop Computer, ATI Radeon HD 4670 GDDR3 256MB, MXM VGA
Amazon.com: Valley Of The Sun Genuine Graphics Video Card Replacement for Apple iMac Mid-2010 Core i5 A1312 27-Inch MC511LL/A MC511 Desktop PC, ATI Mobility Radeon HD 5750 GDDR5 1GB MXM VGA Board
Amazon.com: Graphics Video Card GPU Replacement for Apple iMac Mid-2010 A1312 Core i5 3.6 MC510LL/A MC511LL/A 27 Inch 27" Desktop PC Computer, ATI Mobility Radeon HD 5670 GDDR3 512MB Genuine Parts :
The Ultimate GPU Benchmark (2006 - 2010) - Hardware museum