Hi guys,
I own Dell Inspiron 14 5000 (5447). Bought it 1 month ago. It comes with Intel AC-7260. Had a lot of issues on performance. Call Dell and finally after 3-4 visits, they replaced my AC-7260 with AC-7265. They even gave me dual band AC-3160 and single band N Dell -1707 (Atheros) card for spare. AC-3160 is better than AC-7260 in performance on N networks. But the AC-7265 is much better. With the new card, so far, it is very much better than 7260. I have driver 17.1.0.19. It doesn't disconnect, doesn't disabled after waking up from standby and have a better throughput performance for download for both N on 2.4Ghz and 5 Ghz. Did not test with AC as I haven't an AC wifi router. I am using Asus RT-N66U wifi router. If you own Dell, please call and ask for replacement, Free of charge. As long as you are within warranty periods. I could not try Intel Advance N-6235 as it does not comes with M.2 PCIe 2230 option. I believe that is the best option for N network. My laptop uses M.2 interface for WiFi. On the side note, my HP laptop with Ralink WiFi card outperforms Intel card anytime for N network.
Just to let you guys know.