Is my ram slot not woking

Enomikas

Reputable
Nov 20, 2015
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So I just noticed that out of 6 gb of ram all I use is 2gb.
I have 2 ram slots. 1slot 4gb the 2nd one 2gb after switching them It went up to 4gb and now only 2gb is unusable
So My question is is the 1 ram slot broken? or is there a setting that does that?
Both slots were working around a week ago I noticed the ram missing just today so I'm not sure.
It shows that there are 6gb but only 4 of it is usable
Update: Ram stick is not the problem since 1 ram stick has 2 gb and the other has 4 gb, and if I switch them I will only get either 4 or 2