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
LENOVO THINKPAD R61 LAPTOP | Intel Core 2 Duo 1.80Ghz, 4GB RAM DDR2, 320GB HDD, NO WEBCAM, BUILT-IN WIFI | We also Have i5, i3, i7, 2nd, 3rd, 4th, 5th, 6th gen,
How to upgrade RAM memory in Lenovo ThinkPad R61 laptop - YouTube
2GB [1x2GB] RAM Memory Upgrade for the IBM Lenovo Thinkpad R61 and R61i Laptops | eBay
Refurbished Lenovo ThinkPad R61 Laptop Core 2 Duo 2 Gb Ram 160Gb HDD Windows 7