anyone know if my system spec will be enough to play dota2 smoothly if i upgrade my processor from pentium 4 to core 2 duo 2.6Ghz?

my full spec

cpu : pentium 4 currently ( gonna upgrade to core 2 duo 2.6Ghz if its enough to play dota 2)

ram : 4gb ddr2

gc : geforce gt 610

sound : esi maya 44

currently using this pentium 4, even i play HoN will be bit spiky and not smooth.