Understanding RAM Speed Differences and Upgrades - Mac Optimization Software Reviews
Apple iMac 27-inch & 21.5-inch Late 2009 RAM Memory - Macfixit Australia
iMac Intel 27" EMC 2309 and 2374 RAM Replacement - iFixit Repair Guide
Late 2009, 27 inch iMac can use 32 GB of 1333 MHz RAM, beyond what Apple says - YouTube
Catalina 10.15.3 running decent on my mid 2009 iMac. Gonna max out the RAM to 8GB. 🤗 : r/CatalinaPatcher
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
Can the Late 2009 27" iMac handle 32GB of RAM? | MacRumors Forums
A-Tech 16GB (4 x 4GB) PC3-8500 DDR3 1066/1067 MHz RAM for iMac Late 2009 21.5-inch / 27-inch | 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
iMac Intel 27" EMC 2309 (Late 2009) Memory Maxxer RAM Upgrade Kit
iMac "Core i5" 2.66 27" (Late 2009) Specs (Late 2009, MB953LL/A, iMac11,1, A1312, 2374): EveryMac.com
iMac (2009) RAM & Storage Upgrades
Install memory in an iMac - Apple Support
iMac "Core 2 Duo" 3.06 21.5" (Late 2009) Specs (Late 2009, MB950LL/A*, iMac10,1, A1311, 2308): EveryMac.com
iMac (Early 2009) | Low End Mac
iMac (21.5-inch, 3.33GHz Intel Core 2 Duo, Late 2009) | iGotOffer
iMac RAM Memory Installation 2009 2010 2011 21 5" Apple Dollars #13 - YouTube
apple-history.com / iMac (Late 2009)
Apple iMac 3.0Ghz Core 2 Duo 21.5-Inch (Late-2009) *No HDD/RAM* – MSU Surplus Store
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
apple-history.com / iMac (Late 2009)
iMac | 3.06 GHz Core 2 Duo | 21.5 Inch | Late 2009 - Techable.com
Install memory in an iMac - Apple Support
A-Tech 32GB (4 x 8GB) PC3-8500 DDR3 1066/1067 MHz RAM for iMac Late 2009 27-inch (Quad-Core i5/i7) | 204-Pin SODIMM Max Memory Upgrade Kit at Amazon.com
Late 2009 Core i5 & i7 iMacs OWC MaxRAM Certified To 32GB Of Memory
Install memory in an iMac - Apple Support
