Front Firewire Port Slower?

Hello,
An associate just got a Mac Pro, 2GB of Ram. We are setting the system up & the only thing installed right now is the OS and FCP. Working from an external Firewire 400 drive, FCP won't play even one video track of DV without getting a warning of dropped frames due to a slow drive when plugged into the front port. We plug the same drive into the back port and we can play 3-streams of DV that have been resized, in real time (all the media the project has). So is the front port naturally slower? Or is something amiss?
Mike

I have a similar problem here when connecting my HDV camcorder to the front firewire 400 port and capturing HD video from iMovie.
The captured video is jerky and a lot of artefact appear as if the firewire throughput wasn't able to sustain the HD stream transfer.
When connecting the same camcorder to the rear firewire, the problem disappears.
I have no other firewire device connected
iMovie HD 6.0.3
Camcorder Sony HDR-HC1
I'm thinking it's a hardware problem.
Mac Pro 2x2Ghz 2Gb RAM Mac OS X (10.4.8)
Mac Pro 2x2Ghz 2Gb RAM   Mac OS X (10.4.8)  

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    When I switched to mLan, admittedly running potentially tons more channels in/out, the internal FW bus "fell over" (connector on the front and the 400 and 800 connectors are all on the same bus no matter it turns out).
    I popped a PCI firewire card and the audio stuff worked MUCH better, it was immediate. That's not to say that things work perfectly now... if the machine has been in sleep mode for a while, mLan's autoconnector hangs quite severely, whereby it's not even possible to force quit it... really ugly actually.
    at any rate... for 8 in/out, certainly on MOTU, the on-board FW will "do", but it's probably best to get another FW card, especially if you're going to put sample libraries etc on an external FW drive, then you'd want that to be separate from the audio streams...
    hope this helps!
    Michael
    g5.2x2.0   Mac OS X (10.4.3)  

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