Upgrading the RAM in 3rd Gen X1 Carbon (soldering experiment) : r/thinkpad
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Inside Lenovo ThinkPad X1 Carbon 8th Gen - disassembly and upgrade options | LaptopMedia.com
Lenovo ThinkPad X1 Carbon 6th Gen 2018 Disassembly and RAM, SSD upgrade options - Laptopmain.com
Lenovo ThinkPad X1 Carbon G4 i7-6600U 2.6GHz 256GB SSD 16GB RAM NO OS - READ! | eBay
New Upgrade Version For Lenovo Thinkpad X1 Carbon Notebook Motherboard 12298-48.4ly06.021 Cpu I5-4300u 8gb 100% Test Work - Laptop Motherboard - AliExpress