PC using high amounts of RAM when idle (up to 50%) for no reason.

Heyo all.
I built my PC a few weeks ago, and it's mostly been going with no problems. However, I've recently noticed that after using my PC for a while my RAM usage continually increases for no reason. As I type this I only have Firefox, Avast Antivirus and Puush running, yet my PC is using 4.40GB of my 8GBs RAM. I've looked through the processes tab and resource monitor, but there I cannot see where this RAM is going. The total usage adds to a lot less than what is actually being used.
I've been looking around on the internet for quite a while now and cannot find anywhere with a solution. Plenty of people have said that this is just Windows and the memory will go down when it is required, but I don't see why Windows would use half my RAM while just being idle. I also tried running Titanfall but my framerate dropped to 20fps multiple times due to the high RAM usage.

I'm completely at a loss as to what the culprit could be, does anyone know of a potential solution?

EDIT: This usage actually appears to be climbing. It's at 5GB now and slowly increasing.

Welcome to the forum.

Post a screnshot of Task Manager - Performance tab, so we can see what the situation is.

The sum of the memory usage columns will not equal total memory usage. Modern operating systems are far too complex for anything that simple. Among other things there are major users of memory that are not processes.

LMiller7 said:

Welcome to the forum.

Post a screnshot of Task Manager - Performance tab, so we can see what the situation is.

The sum of the memory usage columns will not equal total memory usage. Modern operating systems are far too complex for anything that simple. Among other things there are major users of memory that are not processes.

Performance tab: http://puu.sh/cV4PS/fdc05c214b.png (It was rising very slowly, now it gradually rises and falls)
Running Processes: http://puu.sh/cV4V5/4977098562.png

Apologies if there's a delay to my replies, it's quite late where I live :P

The problem is the Non Paged pool. 3542 MB is many times a reasonable value.

This is most likely a driver problem. I will have to leave that to others.

In the lower left corner of the Task Manager - Performance tab shows a value of 3542 MB for the Non Paged pool. This is far beyond anything reasonable. The problem is very real.

I most strongly disagree

Having almost half of RAM tied up in the non paged pool that can never be paged out?
I don't consider that normal.