installed extra 2gb ram

Jan 10, 2019
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I had two 1gb rams i have decided to upgrade and to add instead of one 1gb ram 2 gb which I successfully did. Now I am interested whether this extra 1gb really is in use. Right clicking my computer and in BIOS it does show 3gb but in one of the forums I read that it can be displayed but not really in use, how can I check whether it is really used or not and not just displayed.
 
Jan 10, 2019
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I checked both Task Manager and Resource Monitor and it uses approximately 900mb and says it is at 55%, roughly that percentage means 2gb of RAM, so does it mean that that extra 1gb is just recognised by the laptop but not used?
 
Jan 10, 2019
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Thanks for the suggestions, speccy was really helpful, I tried to open programs, and then I closed as much as possible and it showed 2.09 free memory so that should mean that there is more than just 2 gb ram and it did increase. My suspicion aroused because memory usage does not add up in the task manager, but that seems to be a common issue I guess.
And one additional thing that I have noticed is that after installing additional ram extra memory was taken on my d disc.