To me the only thing that counts on mobo upgrade are pcie slots, ram slots, usb 3.0 slots, sata III slots etc.
The phase design of maximus is obviously be better than extreme 4
but its gonna be a difference of only few hundereds of mhz in overclocking at best. A better cooler is much more recommended.
I think of the motherboard as dumbest necessity, it has no on performance whatsoever other than overclocking which is not really needed in an i7 and cant be done on an i3!! What a tragedy :/
But with maximus you are gonna get some freebies too.
And try gigabyte udh3, it too has an excellent repo and is cheaper than maximus
