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New IPS FHD Upgrade Kit for thinkpad T420 T430 ,And T430S T420S - Page 6 - Thinkpads Forum
ThinkPad T420 CPU-Upgrade auf Core i7 Quad-Core - YouTube
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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