When looking in the MacPro, we have identified the same chip, a Broadband BDR4328, compatible 802.11 a/b/g and draft n. Apple is currently only providing drivers to support b and g wifi format, but once a new driver based on the final n format will be available, the Mac Pro should be able to use it immediately.
Broadcom does not provide reference for this card, but it seems to be the same one used in Dell computers.
After having downloaded Dell drivers, we have installed the driver after modifying the driver to install it via WinXP
After rebooting we obtained confirmation of our hypothesis:
