Teardown of Retina MacBook Pro finds soldered RAM, proprietary SSD | AppleInsider
X1 Extreme Expansion Opportunities - No Soldered RAM in this X1 - Every single X1 Extreme will accept 4TB NVMe + 64GB DDR4 RAM whenever you are ready regardless of what it
How to Upgrade the RAM in Your Laptop | Tom's Hardware
You Can't Upgrade Soldered-On Laptop RAM? Think Again | Hackaday