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T420 CPU upgrade to i7 2860QM quad core. Paste is Thermal Grizzly Kryonaut. More info about upgrade and passive cooling upgrade in comments. : r/ thinkpad
How to change a laptop CPU (CPU upgrade for a Lenovo Thinkpad L540) - YouTube
Lenovo T510 Upgrades have arrived (CPU + extra memory) | TechPowerUp Forums
I repasted my x230's CPU! : r/thinkpad
Upgrading the CPU in ThinkPad X61 — Wenting's Web Page