Eu notei que há muita RAM reservada para hardware (um pouco mais de 8GB).
De acordo com algumas pesquisas rápidas, há incompatibilidade entre sua placa-mãe e alguns dos DIMMs.
De acordo com a resposta de esta pergunta de superusuário :
After much research I've found that the "system reserved" message is a generic message that windows uses to say you that some of your memory is locked by the BIOS. The problem is it can happen for a number of reasons, even a few that are software related, but it's usually hardware.
In your case I think it's a memory compatability problem with your new sticks. One thing that affects memory compatibility is it's density level. Which is how much memory is packed into each memory chip and can affect the hardware's ability to access it. Another related issue is if it's single or double sided, which is if the chips are on both sides of the stick or not.
Além disso, de acordo com uma resposta do fórum do Tom's Hardware (ligeiramente modificado):
I don't see those XX sticks on the support list. I am putting my money that this is the issue.
I have had weird issues like that.
As a matter of fact I have proof that this is the error:
I have had a system that did this exact same issue of not recognizing the full 20GB of RAM. It was like only seeing 14 GiBs or something stupid.
I did sort of "resolve" the issue by swapping the slots. But my client experienced some very interesting issues that perplexed me. I created a post here for it:
My issue (posted below) can be categorized in the same way as your issue I am very positive of. Unsupported modules.
http://www.tomshardware.com/forum/id-1634727/motherboard-running-8gb-modules-4gb-supported.html
The solution: I ordered memory suggested for the mobo and my client has been clear of this issue since then when it was a constantly occurring. Now she can work as normal.
Outro problema semelhante resolvido:
After removing the RAM and buying and installing two new 4GB sticks of RAM, my problem is solved!
Now I have less than 100mb hardware reserved.
After adding the old ram to the mix to give me 16gb, I am back to having 4gb hardware reserved, but now have 12gb dedicated.
So I think one of the old RAM modules must be faulty somehow.