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HP ProBook 4520s review: HP ProBook 4520s - CNET
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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
A-Tech 8GB (2 x 4GB) RAM for HP PROBOOK 4520S | DDR3 1333MHz SODIMM PC3-10600 204-Pin Non-ECC Memory Upgrade Kit at Amazon.com
Amazon.com: SATA DVD writer GT30L for HP Probook 4520s 15.6" Notebook New Genuine : Electronics