OFFTEK 1GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad T61 (1959-xxx) (DDR2-6400) Laptop Memory at Amazon.com
How to upgrade RAM memory in Lenovo ThinkPad R61 laptop - YouTube
Lenovo T61 laptop 14" Intel Core 2 Duo 2.0GHz 2GB RAM 160GB HDD WIFI LINUX | eBay
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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) : Amazon.in: Computers & Accessories
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Tutorial: How to upgrade ram in a T61 Thinkpad - YouTube
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IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
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
I “think” you enjoy this… T61 (256 Gb SSD Debian 10, RAM 4 Gb) and E14 2021 (upgrade with RAM 16 Gb, 1 Tb M.2 for Windows 11 and 256 Gb SSD for Debian 11, all Crucial) : r/thinkpad