Cpu-z=1600mhz,bios=1333mhz help

hey guys just build my own pc with help of yours,

config is:

m5a99x evo r2

fx8350 

2*4 =8gb 1600 mhz corsair ram

cm haf 912

seagate barracuda 1tb

asus gtx 650ti-1gd5.

just noticed in bios my ram freq. is 1333mhz but in asus Ai suite and cpu-z is shows 1600mhz

i'm at stock cpu clocks

bios at stock settings.

guide me for this please

p.s=sorry for this long paragraph :p

you can manualy set youre ram speeds in the bios ai tweaker menu, it set to auto, chance that setting to 1600mhz.