Sorry, didn't see that part. A GPU upgrade will not help you much at all. As you can see in the videos above, the GPU utilization is already very low while CPU usage is high.
You could gain more performance by moving to a new CPU/Mobo/RAM platform.
Compared to today's standards, the AMD Athlon 5350 is a very weak processor. But it is a quad-core and you could still play those games and get around 20-30fps at 720p.
Sorry, didn't see that part. A GPU upgrade will not help you much at all. As you can see in the videos above, the GPU utilization is already very low while CPU usage is high.
You could gain more performance by moving to a new CPU/Mobo/RAM platform.