How many firewire devices..?

So I have a dual 2.0 G5 with an RME fireface and a Mackie Onyx 400f chained together and acting as an aggregate device over firewire (400). All well and good. But I'd now like to add an external firewire hard drive (or two), and possibly a PowerCore firewire.
I imagine I can't go on chaining devices forever, so I guess my question is, how many devices can I add before I start seeing problems? Is a couple of audio interfaces and a couple of hard drives too many already, without throwing a PowerCore into the mix?
Would appreciate advice from anyone who already has a whole bunch of devices chained... how's it working out for you?
Thanks!
Miles
G5 Dual 2.0 Mac OS X (10.4.7)

Miles:
Currently, I have six. No problems, but I'm not using similar devices.
The only problem I ever had with multiple devices was the order they are chained, so you might have to experiment (usually I found that disks work best at the end of the chain).
The max number is 63, 16 on one chain - so you have some room to grow
Here's the official word:
http://docs.info.apple.com/article.html?artnum=58585

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How many firewire devices..?

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