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A-Tech 8GB Module for Lenovo ThinkPad T440 Laptop & Notebook Compatible DDR3/DDR3L PC3-12800 1600Mhz Memory Ram (ATMS350685B12351X1) at Amazon.com
Lenovo ThinkPad T440S Laptop - Intel Core i7-4600U 2.1GHz, 16GB RAM, 512GB SSD, 14 HD Display, Integrated Graphics, WiFi, Win 10 Pro 64-bit, 2 Years Warranty, Grade A Refurbished - PC5-3837-REF at TigerDirect.com
LENOVO T440s - Upgrading RAM and Hard Drive - YouTube
Amazon.com: Lenovo Thinkpad T440 High Performance Business Laptop, Intel Dual-Core i5-4300U up to 2.9 GHz, 4GB DDR3, 500GB HDD, 14in HD LED-backlit display, WiFi, Windows 10 Pro(Renewed) : Electronics