LENOVO THINKPAD EDGE E540 20C6008QUS QUAD CORE 15.6 WINDOWS 7 PROFESSIONAL BUSINESS NOTEBOOK PC (INTEL CORE I7-4702MQ 2.2GHZ, 500GB PRO PERFORMANCE SSD, WINDOWS 7 PRO LAPTOP, 16GB RAM) - GTIN/EAN/UPC 712691384931 -
8GB (1X8GB) Memory Ram Compatible with Lenovo Thinkpad E540 Notebook By CMS A8 - Computer Memory Solutions
How to add Ram memory Lenovo ThinkPad E540 - YouTube