Running at 3600 or 2666mhz?

CPUz shows dram frequency as 1800, so dual channel would make it 3600 I guess, but why does bios show 2666 in the lower section of that pic, but above section shows 3600
 
So i turned of DOCP to see what reading it gave me in info section(see pic) in the bios, with docp of the info will say 2666(previously 3600), turned in on and says 3600 in info. But still shows 2666 in dram status.
 
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