For LENOVO ThinkPad T420 T420i CPU Cooling Fan with Heatsink 04W0408 - AliExpress
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
This is my new-old laptop – The Blog
Ssea New Cpu Cooling Fan For Lenovo Ibm Thinkpad T420 T420i T420s 04w0627 - Laptop Cooling Pads - AliExpress
Best CPU for Dell PowerEdge T420? : r/homelab
Lenovo ThinkPad T420 Business Laptop, Intel Core i7-2nd Gen. CPU, 8GB RAM, 256GB SSD, 14 Display, Windows 10 Pro, Refurbished Laptop
T420 CPU Heatsink Threaded Screw - any suggestions? : r/thinkpad