HP Elitebook 8540w 15.6" i7 2.80GHz Laptop Windows 10 Professional 4GB 500GB DVD-RW WiFi Power Adapter
16GB 2X 8GB Memory for HP EliteBook 8440w 8540w Mobile Workstation Quad Core DDR3 PC3-10600 1333MHz 204 pin SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
HP EliteBook 8540P RAM Upgrade Installation instructions with 2nd RAM under keyboard - YouTube
HP EliteBook 8540w Mobile Workstation ... - Added Dimension
Upgrading memory in HP EliteBook 8540w system - Online PC Support
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Solved: RAM memory in Elitebook 8560w - HP Support Community - 1066529
How to install SSD in HP EliteBook 8540w | Hard Drive replacement - YouTube
Extra RAM not working in HP elitebook 8540w - Microsoft Community