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OS X El Capitan Compatible Macs and System Requirements: EveryMac.com
Replace your 2009-2012 MacBook Pro HD with an SSD
The MacOS Sierra Compatibility List | OSXDaily
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Apple MacBook Pro Late 2011 661-6079 i7-2620M 2.70Ghz Logic Board Assembly | eBay
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List of Macs Compatible With macOS Big Sur - MacRumors
MacOS Big Sur Compatibility & Supported Macs List | OSXDaily
Apple Adds Early 2011 13-Inch MacBook Pro to Obsolete Products List - MacRumors
Mac OS X Snow Leopard [Fresh Copy] running on my Early 201… | Flickr
macOS compatibility: What macOS versions can my Mac run? | Macworld
macOS High Sierra Compatible Macs and System Requirements: EveryMac.com
Which Versions Of macOS Are Compatible With Your Mac? - YouTube
Identify your MacBook Pro model - Apple Support (IE)
Identify your MacBook Pro model - Apple Support
256GB 2.5 SSD | OS X El Capitan 10.11.6 Loaded | MACBOOK PRO 2009 2010 2011 2012 | eBay
macOS compatibility: What macOS versions can my Mac run? | Macworld