Why not involve all the memory?

the video card to the scrap

RAHUC
What does it mean? How to do this?

Ne4ai
video card plug it seems that it is not sposobna office podkopay and buy a gtx 1660s esle expensive rx580

Ne4ai
Save up for an upgrade. In your screenshot you can see that CPU is 100% loaded, because of this incomplete the GPU is 59%.
Spoiler
Consumption of VRAM depends on the game itself. Somewhere can be used all: new games with better textures, etc., and in the old and nenavorochennye graphically can be used only part of it.
This system will be able to play relatively undemanding games to iron - 2-core processor may limit the performance of even a graphics card. The once was a Athlon II x2 250 - not yet changed to the x4 640, even with the previous vidyuhi (2 GB GTX 650) had problems in some games. A 4 core normal pulled it with varying degrees of upehom 4GB GTX 960 (now in profile). But of course in processorsamsung games because he, too, had underload vidyuhi .
Spoiler

Recommend a CPU for my build...

CPU: AMD Athlon(tm) II X2 270 3.40 GHz
RAM: 10Gb
Video card: Nvidia GeForge GT 730 (2Gb)

first line: how much you have available to work RAM (+ virtual swap file, if any) on the system overflow of video buffer.
second line: how much you have available to work approx.
this menu information may be incorrect but in your case everything is OK.
in your graphics card 2 GB of memory, and if during a game it is not enough, then as a temporary video buffer will plus be used to 5886 MB of RAM.
so it is clear?
download msi kombustor and turn there test driving the RAM, see what happens.
still can type dxdiag and see the tab screen.
and in fact: do not hammer yourself this question brain, you don't need it.

Ne4ai
if no change mother, there are two outputs - x4 or X6 ( it also ohled better, as your stone is colder and most likely have you under its tdp is) + VC level rx 460 2 GB, which will cost ~7K