After installing more ram, usage shot up?

Feb 20, 2018
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The problem started when I had 8GB of ram. I noticed that my usage was always at around 50% while idle. So was basically always working with 4GB of ram. I installed a second 8GB stick which gave be 16GB. The problem is that the usage is still 50%! What used to be 4GB usage while idle is now about 7.4GB usage while idle. Any reasons why my usage would INCREASE for just installing more ram?