1) DDR3-800 Triple Canal
800 * 64 * 3 / 8 = 19200 MB/s => PC(3)-19200
MTTR = 19200 MB/s
Externo: 800/2 = 400 MHz
Interno: 800/8 = 100 MHz

2) DDR2-400 Dual canal
400 * 64 * 2 / 8 = 6400 MB/s => PC(2)-6400
MTTR = 6400 MB/s
Externo: 400/2 = 200 MHz
Interno: 400/4 = 100 MHz