Are 2 USB on front of 'early 2008 Pro' different circuit from ones on back?

I've got an app that needs to pull from 4 USB 2.0 cameras.
Does the 'Early 2008' Mac Pro use different circuits for the front and back USB connections?
If not, what's a reliable USB card that will work in the Mac Pro?
Thanks!

It's for motion capture using 4 relatively inexpensive Logitech quickCam Pro 9000's.
http://www.ipisoft.com/gallery.php
I'm not sure on the data rate yet, as will have to see what the optimum resolution is for the cameras and the software, which is in beta by a very small company in Moscow (small enough to where as they are exhibiting as SIGGRAPH now, there's no one in Moscow to reply to questions) - complicated by the hassle that I'll be running it on 64 bit Win7 64 in bootcamp (like I don't need one more hassle!)
Hopefully, it won't be anywhere near the full 480Mbps for a single camera.
I guess I'll just have to see when they arrive - probably heading down the path to frustration, oh well!

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    dts2012 wrote:
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    Sounds like MacPro1,1.
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    ===========
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