IBM Thinkpad T61 RAM Replacement - iFixit Repair Guide
Ordenador portátil con RAM de 2GB 2Rx8, PC2-5300S DDR2, 1gb, 667 MHz, 4G, pc2 6400, para IBM, Lenovo, ThinkPad T61, G455, C315, 4022, G530, C100, 7869, todo en uno _ - AliExpress Mobile
1st Thinkpad - T61 - Intel Graphics, 2.00ghz, 8GB ram, 80GB hdd, Windows XP.. I love it. : r/thinkpad
Lenovo Thinkpad T61 Tutorial how to Remove & Hard Drive-Upgrade Memory DDR2 667 MHz - YouTube