In Launchpad bug #1436940, the names QCA6164, QCA6174, and QCA61x4 are all used.
According to https://wikidevi.com/wiki/Qualcomm_Atheros, the QCA6164 has the MIMO config 1x1:1, while the QCA6174 has the MIMO config 2x2:2. What effect does this difference have?
Also, which one has the PCI ID 168c:0041? (It appears that one of them has the PCI ID 168c:003e.)