So let me add a little more.
For 1200 MHz DDR (800 Mhz clock) you will see a bandwidth of up to
1200 x (64 bits / 8 biits per byte) x 2 = 19,200 MB/s for dual channel memory and
1200 x (64/8) x 3 = 28,800 MB/s for triple channel
So you aren't being cheated