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Inspirion 3552

I will want upgrade dell inspiron 15 3552 . It has 4 GB of ram, but I want to install an 8 GB ram. 

The question is if I install a 8 gb ram will it work? I mean will at least 7 GB will remain usable? currently out of 4GB 3. 91 is usable which I believe is normal.

How can i upgrade processor in inspirion 3552?

Thanks!

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