ThinkPad X60: Slowest CPU (T1300) vs. fastest CPU (T7200) - YouTube
I put together an R60 from second hand pieces. $12 for the laptop and another $30 for a battery, cpu and KB (waiting for the US keyboard to arrive) : r/thinkpad
IBM Thinkpad T60 upgrade, CPU, DDR, SSD, MS Office, PS CS and Windows 10 for daily work in 2020! - YouTube
Lenovo IBM Thinkpad R60 CPU Replacement T7200 T1350 - YouTube