If I take the ram up to 16 GB will I get a better performance?
As Skuzzy said. For the game and most other single operations 8 GB is well enough.
However, if you're filming and streaming your game while playing, the extra RAM might be useful. Video editing can take advantage of even more RAM but that would take the entire build to a new level of design. It all depends on what is the toughest task you're planning to regularly perform.
