Why doesn't the task manager show all the used RAM?

Question

Windows

Good afternoon.
I noticed the following: in the task manager, the amount of RAM used is somehow incorrectly shown in the "Processes" tab. I have 16 gigabytes of RAM on my machine. If you count all the memory by processes, you get ~ 4 gigabytes. A shows 43%. But after all, 43% of 16 is 6.88, but not 4 at all. Where do 2.5+ gigabytes go?

How can I find out? I went through several antiviruses (Kaspersky, other Web, Zemana AntiMailware), no one found anything.
Thanks in advance for the replies.

Answer 1

Read - https://habr.com/ru/post/435678/
task manager is not the best tool for understanding exactly what is happening.

Answer 2

The Windows cache is not shown in processes, although memory is allocated for it. See the Performance->Memory tab