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
Inside Lenovo ThinkPad X1 Carbon 9th Gen - disassembly and upgrade options | LaptopMedia.com
ThinkPad X1 Carbon Gen 9 | Business Laptop | Lenovo US