What RAM is compatible for Elitebook 8440p? - HP Support Community - 7269507
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HP Elitebook 8440P Laptop Upgrades / Maintenance: 120GB SSD, Windows 7, Arctic MX-4 - YouTube
HP EliteBook 8440p, i5-m520 2.4GHZ, 4GB RAM 160GB, w/Windows 7 Parts | eBay