Installed on an IBM ThinkPad T60 laptop recently “upgraded” to 2GB of RAM. Catching up on updates since my retail copy is the day 1 release and does not include SP1. :
IBM Lenovo ThinkPad T60 Disassembly video, upgrade RAM & SSD, take a part, how to open - YouTube
CMS 4GB (2X2GB) DDR2 5300 667MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad T60 2013, 2023, 2037-Xxx Series - A37 - Walmart.com
4GB (2GBx2) Team High Performance Memory RAM Upgrade For Lenovo ThinkPad T60 Series (Type 8741) (Type 8742) Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com
ThinkPad T60 – greatest work laptop? – PANORAMA CIRCLE
IBM Thinkpad T60 RAM Replacement - iFixit Repair Guide