I don't know if you can edit the text of your post header.
But, you will get more and better answers if you could post a better hint of your issue.
For a sim, the cpu is, indeed likely the more important characteristic of the pc.
In particular, the single thread performance.
As a quick test, run the cpu-Z bench and look at the single thread performance rating.
It should be about 331 for a 5400G:
https://valid.x86.fr/bench/3adp6j
The 5700g would be a big boost close to double.
Since you have a discrete graphics card, there is no need to pay extra for integrated graphics. You might find a similarly performing 5600X for a better price.
Your current bios level will be shown by cpu-Z.
Most of the time, the only reason to update a bios is to support a new gen processor.