HP Probook additional RAM memory

Hello! I have a laptop Hp probook 450 and 4GB RAM and i want to put another one http://www.emag.ro/memorie-kingston-hyperx-blu-4gb-ddr3-1600mhz-cl9-1-65v-khx1600c9d3b1-4g/pd/E3M7DB... can I do this without lost the warranty ? And can  I do this alone ? Please answer !
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Hi,
Adding RAM to your machine won't void warranty IF this won't cause any damage for the machine. And you CAN'T use that RAM, it won't fit. You have to use laptop RAM. Quick and easy: get a pen, open the RAM door and record what is in there then go out to buy the same.
Regards.
BH
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