Actually the reason for the memory speed discrepancy is not due to dual channel or triple channel configuration. DDR stands for Double Data Rate. DDR memory clocks off of both the rising and falling clock edges so for each cycle of the clock, the memory gets clocked twice because there are 2 clock edges (rising and falling). All DDR memory should report clock speeds equal to 1/2 the "memory" speed (or slightly greater). So, 1600mhz ram needs a clock greater than or equal to 800mhz, 1333mhz needs 667, etc. etc...