Also, be careful that you're looking at the same scale for both.
When you read that fiber channel is "2Gb" that means giga[b]baud[/b] not giga[b]bits[/b] per second.
If you think back to your old modem days, baud means the number of state changes per second of the signal. And because Fibre channel is a serial interface, there's overhead for start, stop and parity bits as well.
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