Just got word from 3com The RCPAG175 PCCARD uses the Atheros AR5001+ chipset. No knowledge of chip changes and revisions, as in they would not know even if there where changes.
There is also a new model on the horizon, RCPAG175B, that should be using the "AR5414 single chip solution". I have not had the opportunity to test mentioned hardware in any way, but someone might find the info usefull.
