Comment 78 for bug 630748

"Support for 4965 is still contained in the iwlagn
    driver even though considered a legacy device. Intel affirms
    802.11n should work. iwl3945 is no longer supported and will never
    have a functional 802.11n mode."

I don't understand this comment either and agree with Alexander Hall; It sounds like 4965 should get working 802.11n in patch. Another point is that 3945 does not have hardware support for 802.11n, it only supports 802.11g.