Windows 10: I installed 2 of 4gb ram cards into my laptop.but its only using 3.9gb.why is that?

I installed 2 of 4gb ram cards into my laptop.but its only using 3.9gb.why is that?

:)

 

Windows shows 8GB RAM installed but 4GB RAM is usable

Hi There,

I've just upgraded my pc from 4GB RAM to 8GB RAM. Windows seems to have detected this upgrade but why does it show as only 4GB RAM available. The following is what I have tried so far with no luck:

• I have tried the msconfig method on ensuring maximum memory is not checked.
• physically removed the new RAM and reinstalled it

Any thoughts/suggestions on how i can resolve this matter?

Thanks

 

Can I upgrade to 8GB (4gb * 2) Ram?

In addition to Post #2, I'd suggest looking at Gigabyte's recommended memory list for the board. Unfortunately, they have only tested a few 4GB modules. Most of the correct type may work, especially if you're not looking to go above 1333 Hz.

 

1.71gb Usable RAM of 4gb

I have Windows 10 32 bit installed in my laptop. I upgraded the memory to 2+2gb. It has two slots. BIOS Says that the RAM is 4gb Installed. But in my windows it looks different. It has 4gb, 2.98gb Usable. I try to replugging the RAM. After it, the usable
RAM is 1.71gb of 4gb ram. I have tried to uncheck maximum memory in MsConfig, but nothing was happened. You can see the shared memory in the image below. I tried to open the bios, it says 4 gb of ram installed. My laptop is Lenovo B40-45 with AMD APU A8-6410
Processor. How to solve the problem? Help me please