Zerk2012 :
It should run up to 2666 just fine anything higher might take some tweaking or overclovking on a Z170 board.
If your not using a Z board then you can still use 2400 but it will run st 2133.
ty for the answer!i will get a asus sabertooth z170 mark1 motherboard,so it's the Z chipset,which allows OC.i'll play abit with the frequencies,see how it goes.