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Upgrade 24” iMac video card - ATI Radeon 256MB to NVIDIA GeForce 512MB - Ask Different
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Early 2008 iMac 24" GPU Upgrade Options | MacRumors Forums
iMac Intel 20" EMC 2133 and 2210 Video Card Replacement - iFixit Repair Guide
iMac A1224 Graphics Card Repair (Early 2008) ATI Radeon
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Upgrade 24” iMac video card - ATI Radeon 256MB to NVIDIA GeForce 512MB - Ask Different
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iMac Intel 20" EMC 2133 and 2210 Video Card Replacement - iFixit Repair Guide
iMac A1224 Graphics Card Repair (Early 2008) ATI Radeon
GPU Heatsink 730-0483 with Sensor iMac 24 inch A1225 2007 2008 Original for NVidia 8800 GS 512 MB - used original spareparts for Macs
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Use Oven to Fix iMac Hardware Issue | My Big Data World
iMac GPU cooling mods – Pizza Undervolt
My 20 inch 2008 iMac upgraded to Big Sur : r/BigSurPatcher
Apple Video Cards - iFix Mac Computers
Baking a Graphics Card | macman860
Big Sur running on an early 2008 MBP, with working GPU acceleration! thanks OCLP : r/BigSurPatcher