OFFTEK 1GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad R51 (1831-xxx) (PC2700) Laptop Memory at Amazon.com
IBM ThinkPad R51 - YouTube
Upgrading to a Faster Hard Drive in a ThinkPad R51 - YouTube
OFFTEK 256MB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad R51 (1836-xxx) (PC2700) Laptop Memory at Amazon.com
4X 512MB RAM Memory 4 IBM Lenovo ThinkPad R51 Notebook Series DDR1-PC2700 A49 | eBay
Meet this bad boy from 2006, IBM ThinkPad R51 with Celeron M and 256 MB of RAM. Still works fine and is in good enough condition considering it being 14 years old.
Laptop IBM ThinkPad R51 TYPE 1829 - Sklep, Opinie, Cena w Allegro.pl
256MB RAM Memory for IBM ThinkPad R51 Series (Type 2888) Black Diamond Memory Module DDR SO-DIMM 200pin PC2700 333MHz Upgrade System Specific Memory - Newegg.com