A-Tech 4GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010, Mid 2011, Late 2011), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Module at Amazon.com
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Gaming with 4GB of RAM in 2022... - YouTube
RAMGS/4 - 4MB memory expansion for the Apple IIgs | gglabs.us