I have a 802.11g network at home and have just put a PCI card which is recognised as an Airport card in a Mac G4 with OSX 10.4 - so far as I know, the machine is only capable of 802.11b speeds (11mbs) but the seller assures me it will now be running at 802.11g (54mbs).

During installation and since then t doesn't make any mention of Airport Extreme, which is capable of 54mbs, but only on newer machines.

Is there any way to check the actual transfer rate?