I understand the game to be cpu dependent.
I think a typical G3258 can be overclocked a bit higher with good cooling.
If you are using the stock cooler, a Cryorig H7 will perform better than the stock cooler.
If you are using the stock cooler, check to see that it is mounted well.
You should be seeing 10-15c. over ambient at idle.
If you take your case covers off, the cooler will get more fresh air to work with.