Time capsule wireless so slow with one Macbook but not other

We have a Time capsule network set up to run at 5 GHz, and (out of necessity because of the problems) an older wireless g access point running in parallel.
One macbook running Leopard gets good speed when connected to the 5Ghz network, as does the Apple TV, which can also stream almost flawlessly by airtunes to an airport express connected to a hifi.
However, if I try to connect to another macbook (still running Tiger) to the time capsule network (even with the other components switched off) then the connection is frequently really slow, such that the web becomes unusable and it is impossible to reliably stream to the express or ATV. However, if I switch to our old g rated wireless access point connected to the same router as the Time capsule then I get a much higher speed connection, although airtunes still intermittently drops sound, but I can stream an HD movie to ATV with no problem.
Why is one Macbook fine but the other is so slow on the 5Ghz network?

Glad to see the overwhelming response to my post : )
Anyway, I have upgraded the OS to Snow Leopard and the 5Ghz network seems to have speeded up considerably on this macbook. Perhaps it was a problem with Tiger.

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