thanks. is for gaming, since faster RAM does improve min FPS in some games. used Haswell parts seem to be cheaper now, while unlocked CPUs are still quite expensive new. but yea this would need a Z board and high speed DDR3 RAM. just thinking about possible upgrades for Haswell 4590, or wait for next gen.
on Skylake at least the min is DDR4 2133 for non Z, faster than DDR3 1600.