1) DDR3-800 ->
800 MHz * 8 bits / 8 = 800 MB/s => PC(3)-800
Interno: 800 MB/s
Externo: 100 MB/s

2) DDR2-400 ->
400 MHz * 4 bits / 8 = 200 MB/s => PC(2)-200
Interno: 200 MB/s
Externo: 50 MB/s

3) PC(1)-1600 ->
1600 * 8 / 2 = 6400 MHz => DDR-6400
Interno: 12800MHz
Externo: 6400MHz