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HP EliteBook 8540P RAM Upgrade Installation instructions with 2nd RAM under keyboard - YouTube
HP EliteBook 8540p/2.4GHz i5-M5204GB RAM/128GB SSD/DVDRW-Win10PRO New Battery! | eBay
HP EliteBook 8540P 15.6 Laptop PC, Intel Core i5-520M up to 2.93GHz, 4G DDR3, 320G, DVDRW, WiFi, VGA, DP, Windows 10 Pro 64 Bit Multi-Language Support English/French/Spanish(Renewed) : Electronics - Amazon.com
HP EliteBook 8540p/2.4GHz i5-M520/8GB RAM/120GB SSD/DVDRW-Win10PRO | eBay
Amazon.com: HP EliteBook 8540P 15.6 Laptop PC, Intel Core i5-520M up to 2.93GHz, 4G DDR3, 320G, DVDRW, WiFi, VGA, DP, Windows 10 Pro 64 Bit Multi-Language Support English/French/Spanish(Renewed) : Electronics