Apple iMac Repair, iMac Upgrade, iMac SSD Upgrade – TECHWERX
Intel iMac 24" NVIDIA GeForce 8800GS 512MB Video Card, Early 2008 DIY Parts replacement Video Cards
Adding an external GPU to your Mac is probably a better upgrade option than getting a new one | TechCrunch
YouTuber upgrades base-model 5K iMac with seventh-gen Intel Core i7 processor, 64 GB of RAM, and more [Video] - 9to5Mac
iMac Intel 20" EMC 2133 and 2210 Video Card Replacement - iFixit Repair Guide
Breathing New Life into a 2007 iMac with an SSD Upgrade – Not Quite Mainstream
Amazon.com: Genuine Graphics Card GPU Replacement for Apple iMac Mid-2007 A1224 Core 2 Duo 2.4 MA877LL 20 Inch Desktop PC, ATI Mobility Radeon HD 2600 Pro GDDR3 256 MB, MXM Video Board
Upgrade 24” iMac video card - ATI Radeon 256MB to NVIDIA GeForce 512MB - Ask Different
How I kept my iMac running for a decade | Cult of Mac