Mihai_21 :
Which one should i get ? the i5 6400 is 190$ and i5 6600 is 250$ in my country.I'm going to buy one of them 2 inhours
i5 6600 is considerably better than the 6400. If you can afford it, no reason to go slower.
If you don't want to pay that much, try to grab a 6500.
Or, if you wanna go all out grab a i7 6700.