New G50-45 only able to use 3.46 of its 8GB of RAM

Hey hey people.
I just purchased a Lenovo G50-45 laptop the other night, and while it's working fine, my memory useage is constantly at about 60%+ for reasons unknown to me. I checked the system specs and it says that it does in fact have 8GB of RAM installed, but only 3.46 of that RAM is actually usable.
Any ideas as to why this is? I cannot seem to find out myself.
Thanks!
EDIT: I seem to have mostly fixed the issue by going in and swapping the places of the ram sticks. I'm now down to about ~20ish% of memory being used, with 6.96 GB of usable RAM.

If you are running windows 7 or 8 in 32bit you will not be able to use more than 4gb of ram. If 64bit you should be using all of it. If swapping memory sticks in sockets fixed this, you may have had one stick not fully seated in the socket.
If issue has not been corrected, you may have either a bad stick of memory or a bad socket. Would suggest contacting Lenovo Support or taking back to point of purchase for replacement.

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