Does my memory sub-working?

Sonicastar

Honorable
Feb 26, 2015
10
0
10,510
Hello everyone. Dont have much to say just look at the photos. Is my memory not working as it has to?
http://postimg.org/image/6dr7u6l6f/
http://postimg.org/image/629rhf4qf/
http://postimg.org/image/4wqrhdgr9/

Why it is able to use only 3GB when i have 8GB installed?