Vinyl530 :
anti-duck :
It'll run all those games you listed, with Arma 3 and DayZ running at ~5fps.
Then what would I need to upgrade?
Mostly the cpu, and graphics card. Since you have an amd athlon, you cant upgrade to the fx series. I would get an athlon x4 630, and i would get an amd 27 265. Also, go to this website called game-debate to help you if you can run these games