FW 400/800 share the same bus?

On the 17" powerbook 1.67GHz, do the FW 400 and the FW 800 ports share the same bus?

Hi. Confirming what I just read... If I get a seperate firewire card for my lap top then my mac will read it as a different port and therefore I can operate at 400 firewire from my firewire card and operate at 800 firewire on the internal port?? Just confirming that if I have two seperate (the external card and the internal ports) that the mac will read them differnetly and thus not slow speeds to the 400 speed universally??
Did that question make sense?! Thanks!

Similar Messages

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    http://www.infinitecables.com/pop-usa/cb_1394b-49.htm
    http://eshop.macsales.com/item/Newer%20Technology/1394B94036/
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