Previously I wrote about how the Dell Inspiron 5379 would use 802.11n as opposed to 802.11ac when attached to the Fios Quantum Gateway router. I suspected that the Qualcomm QCA6174 wireless network interface card was the culprit, but given only one sample I could not say for sure. Today I found a second example.

When setting up a new desktop based on the MSI X99A GODLIKE GAMING motherboard, I noticed that it too would be stuck at 802.11n with my Fios router.  The motherboard boasts “Killer WIFI” and uses the “Killer Wireless-n/a/ac 1535 Wireless Network Adapter” as described in Device Manager.

Guess what, the Killer 1535 is based on Qualcomm Atheros QCA6174A. I think that explains it. Chances are the Killer 1435 based on the same chipset will have the same problem.