I5 3470 can easily handle any games with hd 7870.go with hd 7870.Gpu matters more than cpu in gaming.
lol. Well that isn't quite true now is it. I mean it's a question of what the game requires. Yes in this case where we are talking about the 3570K you can probably say that the better the GPU, the better perfomance. But this in most cases you want to make sure you have a good CPU before even starting considering the GPU.