Need to look in CPU-Z, the memory tab to see what DRAM is running at, am guessing if CPU-Z you are looking at the SPD tab which is nothing more than info from the sticks, not what they are running at....in the memory tab if they are 1600 should show as 800 since this is DOUBLE data rate (DDR), if at 667, then they are running 1333 or at the mobos default and need to be set manually or through the DRAM OC profile (on Intel = XMP, AND rigs might use XMP, or DOCP or EOCP)