CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad W540 20Bhxxx; 20GBxxx Series - A7 at Amazon.com
Refurbished: Lenovo ThinkPad W540 Workstation 15.6" Full HD 1920 x 1080 Resolution Laptop - Intel Quad Core i7-4800MQ 32GB RAM 256 GB SSD + 1TB HDD WebCam WiFI DVDRW Windows 10 Professional
Used(good working little Scratch) Lenovo ThinkPad W540 Mobile Workstation 15.6" FHD Business Laptop Computer, Intel Core i7-4800MQ, 8GB RAM, 250GB SSD, NVIDIA Quadro K1100M, Windows 10 Professional - Walmart.com