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
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The story of my highly upgraded Lenovo T420 | The caffeinated engineer
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Thinkpad T420のCPUの30%でCompiz
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Lenovo T420 Windows 10 Drivers, Thinkpad T420 Laptop Upgrades
T420 (41786vu) and CPU upgrade to i7-2670QM bios update? - Thinkpads Forum