FutureMark looks at the DRAMs default boot spec from the SPD of the sticks, which doesn't really mean anything, it's simply info from the sticks SPD, to find what your sticks are running at look at CPU-Z (free app) in the memory tab, take what shows in Freq times 2 as this is Double Data Rate (DDR) so if it shows 667 you are running 1333, if it shows 800 you are at 1600, etc