IPhone File Transfer Speeds

I have two MacBooks and two iPhones and I'm seeing very different file transfer speeds between the two. Both have the backup option manually disabled to improve sync times.
Setup 1: iPhone 3GS with MacBook Pro (15-inch, Late 2008) model
Setup 2: iPhone 3G with Black Macbook (13-inch Mid 2007) model
The time it takes to sync video between the two is drastic with the newer model copying files in a few seconds, and the older setup copying files over 5-10 minute periods.
I have yet to swap the two iPhones on the two computers but from a technical perspective, I don't understand why one would transfer files faster than the other. Both are using USB 2.0 and I've already tried using the same cable for both. Anyone see similar behavior? Is this a facet of the older computer or older iPhone?

As an example, a USB host on a PCI bus will send or receive the data via the PCI bus; the stack will prepare the next data in memory and receive interrupt from the host. That's what I mean, how that's implemented.

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