Should you consider upgrading your GPU?
Should you consider upgrading your GPU?
Your CPU seems to be underperforming. It's unclear which YouTube video you viewed, but your system appears to be imbalanced, so upgrading the CPU could improve performance.
The 6400 fits well with the 1070, offering a balanced performance—neither too strong nor too weak. You can decide which component to upgrade first depending on your needs. If you're running many applications simultaneously, starting with the CPU makes sense, though you're mainly into gaming. For graphics, prioritize the GPU. Remember, ACO and SotTR can be challenging to run optimally without optimization.