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. :
Picked up a cheap Lenovo T60 for Uni, wanna know what upgrades to make : r/ thinkpad
IBM Thinkpad T60 RAM Replacement - iFixit Repair Guide
1GB Stick for IBM Lenovo ThinkPad T Series T60 Type 8741 8742 8743 8744. SO-DIMM DDR2 Non-ECC PC2-5300 667MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
CMS 8GB (2X4GB) DDR2 5300 667MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with IBM Lenovo® Thinkpad T61, T61P Ddr2 Pc5300 Sodimm - B116 at Amazon.com