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USB VS. Firewire Cam

i’m using an Xbox Webcam at the moment and getting roughly 20% processor usage.

I’ve been looking at the unibrain fire-i board cams and I se that they’re IIDC compatible.

If i purchase an Unibrain cam, what processor usage would I be looking at? anyone with any idea?

another option is buying a capture card… is that a much better solution?

PS. I’ll be doing IR tracking.

  FireWire, uses a "Peer-to-Peer" architecture in which the peripherals are intelligent and can negotiate bus conflicts to determine which device can best control a data transfer
  Hi-Speed USB 2.0 uses a "Master-Slave" architecture in which the computer handles all arbitration functions and dictates data flow to, from and between the attached peripherals (adding additional system overhead and resulting in slower data flow control) 

so thats where ur cpu cycles go…
some firewire cams also deliver uncompressed frames without significant latency, unlike DV cams which are 1/2 second late
and of course go for non-interlaced
capture cards are ok, analog video cables can go up to 50 meters, but you get interlaced video on higher resolutions than 320x240
hope this helps

thanks for the reply.

I already know about the latency issues regarding USB vs. Firewire as I have quite a lot of experience with Macs.

However, I’d like some information specific to the unibrain Fire-i and its performance if you have any.

The capture card information is also quite useful. thanks.