Question about USB & Firewire cards

For years we've been used to the Mac way of combining USB and/or firewire ports on to one bus. Plug in a slower device and the other faster devices on SEPARATE ports may slow down to the slower speed (depending on your Mac model, configuration, etc.).
I am looking at PCI cards for USB, firewire, and esata and non of them I've seen mention this. Is it safe to assume that most of them truly have an individual bus per port? In other words, if I plug a slower device into one port, will the other ports generally continue to operate at higher speeds? For instance, if a card has three FW 800 ports, but I plug a 400 device into one of them, will the other two continue to operate at 800 speeds?
Anyone have any recommendations for a good USB & Firewire 800 & 400 card that will negotiate speed per port like I am asking?

It's not a good assumption. Read the adapter's complete specifications carefully, or if you already have the adapter, you can look at the system profiler to see how many separate buses it has.

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