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HP Recommended
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From the following information
https://www.crucial.com/usa/en/compatible-upgrade-for/HP-Compaq/probook-4520s
It has two slots which support 8GB max. But your machine runs Windows 7 (32bit) upgrading to more than 4GB is a waste because 32 bit Windows OS won't be able to access above 4GB of RAM.
Regards.
BH
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