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
Why don't more laptops have upgradable RAM? | Ask an expert | PCWorld
Teardown of Retina MacBook Pro finds soldered RAM, proprietary SSD | AppleInsider
Where is the soldered RAM in this T14 Gen 3? : r/thinkpad
You Can't Upgrade Soldered-On Laptop RAM? Think Again | Hackaday