CPU is not using full potential

[Sokrate]

My PC can not run witcher 2 on High settings in FHD, in game I have 9 fps while cpu is only using 20-30%,also only 4GB ram out of 6GB. gpu temperature is 50 C . What can I do about it ?
(I used msi afterburner for monitoring)
specs:
CPU: AMD Ryzen 3 3200G
GPU: Radeon Vega 8 Graphics 
Ram: 8GB (gpu uses 2gb as vram)
 

[Sokrate]

13 minutes ago, BlueScope819 said:

Because the bottleneck is your iGPU. There is no way a Vega 8 can run it on high settings. Turn it to low, or buy a graphics card.

 check Recommended Requirements for this game. Is not vega 8 better than gtx 260 ? 

[steelo]

Minimum requirements aren't meant to be interpreted as min specs to run on high @60fps. Try lowering to low or medium settings...

[OddOod]

if you can kick 20$ into a jar every months you can quickly grab a decent used 1060 off ebay 

[steelo]

Or a rx 570

[steelo]

31 minutes ago, Sokrate said:

 check Recommended Requirements for this game. Is not vega 8 better than gtx 260 ? 

You have 8 gb of ram. 2-3 gb of that is being used by windows and another 1 gb by your igpu. Also, ddr4 is a lot slower than memory found on a dedicated gpu. Vega 8 is fine for light 720p gaming but a lowly gt 1030 outperforms it by around 10%

[Alex Atkin UK]

35 minutes ago, Sokrate said:

 check Recommended Requirements for this game. Is not vega 8 better than gtx 260 ? 

Also bear in mind that they probably mean 4GB RAM running Windows 32bit, that likely means 8GB on Windows 64bit which you are more than likely running.

As already mentioned, you're going to only have 7GB available as the iGPU is taking 1GB.

Although the most obvious thing here is that said you are running at 1920x1080 not 1440x900, plus recommended may mean Medium or Low settings, unlikely to mean High.