I have a Asus Z87 Sabertooth mobo with an i7-4771 proc. An overclockable mobo with a locked proc. But my sons new build has an Asus B85M-E mobo which is not overclockable. Was gonna get him i5-4570 but was thinking should I get i5 4670k and put my I7-4771 in his mobo and the i5-4670k in my sabertooth since mine is mostly used for gaming. Or should I stick with the i7? Any thoughts? Thank you for taking the time to help.