Firewire port on Mac Pro

If I use an adapter to connect firewire 400 to 800 port on Mac Pro. Will entire firewire bus on Mac Pro reduce to 400 speed or each port is independent?

All ports feed into the same bus, but you can run a 400 device from one port and an 800 device on another port and both will operate to their respective theoretical speeds. However, if you daisy-chain FW800 devices into a FW400 device and then to the Mac Pro, all will operate at 400 speeds.
Matt

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