How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
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Maximum RAM iMac early 2008 | MacRumors Forums
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Memory Upgrades for Apple iMac 2008 - Up to 6GB
iMac | 2.4 GHz Core 2 Duo | 20 Inch | Early 2008 - Techable.com
Install memory in an iMac - Apple Support
iMac 24-inch Early 2008 – Full Tech Specs, Release Date, and Price
Timetec 32GB KIT(2x16GB) Compatible for Apple DDR4 2666MHz / 2667MHz for Mid 2020 iMac (20,1/20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K, Late 2018 Mac Mini (8,1) PC4-21333 /PC4-21300 MAC RAM at Amazon.com