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iMac (21.5-inch, Mid 2011) - Technical Specifications
The MacOS Sierra Compatibility List | OSXDaily
macOS compatibility: What macOS versions can my Mac run? | Macworld
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How to upgrade my Mid 2011 iMac to latest OSX | MacRumors Forums
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Latest macOS compatibility chart : r/MacOS
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
iMac (27-inch, Mid 2011) - Technical Specifications
Further Explained: Apple's iMac 2011 Model Hard Drive 'Restrictions'
Amazon.com: OWC 2.0TB HDD Upgrade Kit Compatible With 2009-2010 iMacs, Includes: Thermal Sensor, Tools, 2.0TB Hard Drive : Electronics
SOLVED: What GPU's are compatible with iMac 27" 2011? - iMac Intel 27" EMC 2429 - iFixit
Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(E... | eBay
Computer Hardware & Mac OS X Lion
2011 iMac Graphics Card Upgrade | MacRumors Forums
Mac OS Compatibility Guide
macOS compatibility: What macOS versions can my Mac run? | Macworld
Apps That Won't Work In macOS Catalina | Macworld
macOS - Wikipedia
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iMac (21.5-inch, Mid 2011/Late 2011, A1311) - Dr. Macbook Thailand
Identify your MacBook Pro model - Apple Support
