Naelradwan7 :
So you mean if I don't need to overclock I go for the b85 and if I want to overclock I go for the z78 and that is the only difference that will show an effect on gaming ??
To put it right, question should be from where the effects on gaming come from? Answer is overclocking the CPU, overclocking the GPU. These are main contributors for performance gain. Better leave RAM out of this discussion.
So, if you are not overclocking then you don't need expensive CPU and mobo. Go for cheap ones with good performance. Otherwise, get the overclocking enabled CPU and mobo and reap the benefits.
Good Luck,