MacBook Pro 15" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S)
MacBook Pro: How to remove or install memory - Apple Support
MacBook Pro 13" Unibody Late 2011 RAM Replacement - iFixit Repair Guide
2011 Macbook Pro 13" A1278 RAM Upgrade - YouTube
macos - What is the maximum amount of RAM a 2011 MacBook Pro can utilize? - Ask Different
16GB MacBook Pro RAM Upgrade (2011/2012/2013) - YouTube
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
A-Tech 4GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010, Mid 2011,