[SOLVED] Only 6.45gb of RAMs usable out of 8gb?

Oct 8, 2019
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Hi guys, please help?
I recently bought a new computer parts. As I finished installing the operating system I noticed my 8gb of RAMs only 6.45gb are usable. I have GPU installed and Bios Settings was set to PCIE/dGPU only. How can I able to use max capacity of my RAMs?

My System Specification
Processor: AMD Ryzen 3 2200G 3.50ghz
Motherboard: Asus EX-A320M-Gaming
RAMs: (2x 4gb) 8gb 2400mhz G Skill
GPU: MSI GTX 950 2gb
PSU: Seasonic 620w
OS: Windows 10 64bit

Thanks in advance.