You actually couldn't be more wrong, the CPU does all the heavy lifting. Yeah depending on your GPU you MIGHT be able to run on higher video settings, or MAYBE get a slight increase in FPS. It's simply due to this game's engine, as it's not that great in the performance department as you can tell. Simply googling this would give you all the proof of why Arma 3 is CPU intensive, and lots of it at that. Stop acting like you're right, cause you aren't.