Friend i don't want this to sound bad but you need 4 cores.
modern games need 4 cores to work smoothly
so what do you think is gonna happen in 1 years, I know DX12... but still.. 4.C.O.R.E.S needed...
GTA V, BF4... games like that are CPU bound!
I have I3 4150 and i get crazy BF4 drops and little GTA V drops.