You should invest in a 3600mhz CL14 RAM. G.skill tridentZ neo has one, you can find them on amazon or newegg.
Reason for that it because 59xx performs way better with lower CAS(CL) and 3600 is the bare minimum you need for 59xx anything lower than 3600 you are just wasting your money on the cpu.
Dont get CL16-18 RAMS no matter how high the clock speed u are loosing out 20-30% extra performance (about 30-40 fps in game)
Simply enable XMP profile and you are good to go.
If you have extra time, you can also manually tweak your RAM timing to get significantly better performance (free performance)
It may sound and look confusing but actually it is very easy.
U can check out this tutorial