4AllDeals 4GB (1X4GB Memory RAM for HP/Compaq ProBook 4435s, 4436s, 4520s, 4525s, 4530s (DDR3-1333MHz 204-pin SODIMM)
HP Laptop ProBook Intel Core i3 1st Gen 380M (2.53GHz) 2GB Memory 320GB HDD Intel HD Graphics 15.6" Windows 7 Professional 32-bit 4520s (XT989UT#ABA) - Newegg.com
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RAM memory for HP ProBook 4520s
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Amazon.com: A-Tech 8GB (2 x 4GB) RAM for HP PROBOOK 4520S | DDR3 1333MHz SODIMM PC3-10600 204-Pin Non-ECC Memory Upgrade Kit : Electronics
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8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for The Compaq HP Probook 4520s (WZ254UT#ABA) (Genuine A-Tech Brand) at Amazon.com
HP ProBook 4520s Intel Core i3 M380 CPU @ 2.53GHz, 4GB RAM, 250GB HDD with Microsoft Windows 10 Professional and Microsoft Office 2010 Home & Business.
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HP ProBook 4520s - Notebookcheck.net External Reviews
