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
Bought a T61 with a weird CPU : r/thinkpad
Lenovo ThinkPad T61 15.4" Intel Core 2 Duo 3GB RAM 2.0GHz Docking Station no HDD – ASA College: Florida
4GB 2X2GB Memory RAM for Lenovo ThinkPad T Series T61 ( Type 7665 ) 200pin 667MHz PC2-5300 DDR2 SO-DIMM Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com