"installed" ram less than actually installed

Forum discussion tagged with "installed" ram less than actually installed.
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    Question 16GB of RAM in the motherboard, but Windows shows only 13.9 installed

    I have 16 GB of RAM installed in my Gigabyte B450 Aorus M motherboard in the form of 2x8GB sticks of G.Skill Ripjaws. However when I check the task manager and the system info, it shows I only have 13.9GB of RAM installed... I saved a few images with the snipping tool, but I couldn't paste...