Question 16G of ram but 7,95 usable

Jul 10, 2019
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I guys,
I built my pc a few days ago and I notice that there is only the half of my ram installed usable...
I tried the msconfig thing without any result.
Can you help me??

Here my config:
R7 2700X Gold
Radeon RX 580
B450 Gaming plus
Corsair Vengeance LPX 2X8G
 
You wrote, "I went back in the Bios and I saw that!! It says that the speed of each ram is diffrent!".

The picture shows the memory come with two XMP profiles. You can choose to enable either profile.

If you have a question about memory, I suggest you list a part number of the memory or a link to it.