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HP ProBook 4540s 15.6" Intel Core i5-3210M 2.5GHz / 4GB / 640GB vs HP ProBook 4730s 17.3" Intel Core i7-2670QM 2.2GHz / 4GB / 750GB: What is the difference?
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HP Probook 4540s (B6N31EA) - Notebookcheck.net External Reviews
HP ProBook 4540s Intel Core i7-3632QM 2.2GHz 15.6" Windows 7 Professional 64-bit Notebook - Newegg.com
HP ProBook 4540s 15.6" Intel Core i5-3210M 2.5GHz / 8GB / 750GB vs HP ProBook 6570b 15.6" Intel Core i7-3520M 2.9GHz / 4GB / 500GB: What is the difference?
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