2GB RAM Memory for HP EliteBook 8440p Notebook Black Diamond Memory Module DDR3 SO-DIMM 204pin PC3-8500 1066MHz Upgrade System Specific Memory - Newegg.com
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How to upgrade hard drive a Hp EliteBook 8540p - YouTube
4GB Team High Performance Memory RAM Upgrade Single Stick for HP - Compaq EliteBook 8540p (Quad Core Processors) Laptop The Memory Kit Comes with Life Time Warranty. at Amazon.com
Solved: Missing RAM slot in EliteBook 8540p - HP Support Community - 1800127