My bad. It was early in the morning
But yea DDR3 benefits are data transfer rates at roughly double that of DDR2 and larger capacity modules and the same applies; The 'DDR' part is Double Data Rate and the number after that is just the 'version' denoting the improvement of RAM technology. So regardless of RAM version it's still 'Double Data Rate' meaning double transfer speeds on each clock cycle.
Hence 800Mhz = 1600Mhz DDR.
The amount of channel links from RAM <> CPU is a different topic.
Staying on subject though it would be interesting seeing TDR(Triple Data Rate) or QDR(Quad Data Rate) or even VDR(Variable Data Rate) RAM. But this would involve complex clock waveforms.