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memory - Added extra RAM the notebook won't start - Super User
What's a recommendation for an SSD upgrade for an HP ProBook 4520s? - Quora
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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
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HP Probook 4520s 15.6" Laptop Windows 10 Home Intel i3 2.53GHz 4GB Ram 320GB Hard Drive DVD WiFi Power Adapter
Just got my Mother's old work laptop. ProBook 4520s, i5 M460. Surprisingly, it games quite well! Thoughts/Suggestions? : r/laptops
HP ProBook 4520s Hard Drive Replacement - iFixit Repair Guide