2GB Memory RAM Upgrade for the Lenovo Thinkpad R61 Series, T60 Series, T61 Series, X60 Series and X61 Series Laptops (DDR2-667, PC2-5300, SODIMM) at Amazon.com
Thinkpad T61 Laptop 2.0 GHz Core 2 Duo 2GB RAM 320GB HDD DVD – Rock Solid!! – ASA College: Florida
Used - Lenovo ThinkPad T570, 15.6" HD Laptop, Intel Core i5-7300U @ 2.60 GHz, 16GB DDR3, NEW 500GB M.2 SSD, Bluetooth, Webcam, Win10 Pro 64 - Walmart.com
How to upgrade RAM memory in Lenovo ThinkPad R61 laptop - YouTube