13-inch MacBook Air (early 2015) review | Macworld
Is It Worth It to Upgrade RAM on a Macbook Pro?
Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini at Amazon.com
Apple MacBook Pro: RAM upgrade (HowTo)
How to use an NVMe drive to upgrade your Mac's SSD | AppleInsider