yorben_vandyck :
ddr4 rams basic clock speed is around 2133mhz so you'll first have to overclock it to see how much your motherboard can take it said it supported 3200 + (oc) so im not sure how much it can accualy handle
what i am understanding from this is that the 4000mhz ram would run as 2133mhz, to achieve higher clocks i'd have to overclock it, but due to limitations of my motherboards it may not achieve the actual 4000mhz.?