g3258 oc will run most game fine, but some game like gtav, witcher3, watchdog or total war ect.. will have massive frame drop,
if on budget get g3258 over i3, or save to get 180$ i5 for long last value.
AMD FX 83xx is a good option if DX12 do it's job as promise, you may also get some value if you use PC to render or convert video, for gaming i5 is still the best option at this time