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HP 4540s Complete Teardown & Upgrade (SSD, RAM, CPU, Wi-Fi Card, Screen) - YouTube
4GB DDR3L-1600 (PC3-12800) SODIMM Memory RAM for HP ProBook 4540s
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OFFTEK 8GB Replacement Memory RAM Upgrade for HP-Compaq ProBook 4540s (DDR3-10600) Laptop Memory at Amazon.com
