Lenovo ThinkPad X1 has two versions – the Carbon, which is the small, thin and light machine, you can take everywhere, and the Extreme Edition, which is also thin and light, for its footprint, but also packs a lot more power with a dedicated GPU and H-series processors.

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https://laptopmedia.com/highlights/inside-lenovo-thinkpad-x1-extreme-gen-2-disassembly-and-upgrade-options/