(2016-12-20 19:45)mechevarria Wrote: I previously had a HDTC-2US. I also have an Asus AC1900p router which is in the RT-AC68U family. Figured this out because viewing was absolutely perfect on my kodi htpc which was on ethernet, but all wifi devices were stuttering (phones, FireTV). Turns out the HDTC-2US can stream HD over A/C wifi, but not over N. The HDTC-2US-M can stream HD over N. I wasn't going to put my router in A/C mode so I went with the upgrade.Unfortunately this is likely purely coincidental that this solved something for you. The only difference between the original HDTC-2US and the new M version is the passive heat sink case used compared to the older fan based unit. The internal hardware is identical. In fact, SD will convert your old EXTEND to the new case for a fee.
The hardware transcoding profiles between these 2 units are identical as well. So all this AC vs N stuff is speculation - because we all know that streaming any video over WiFi is spotty at best - and hardwiring will always win the day because it is much more stable. Wifi can fluctuate too much in continuous signal quality to be that reliable for everyone. If you pick a very compressed stream you might get it to work over N - but again not everyone will be successful at this because every setup and environment is different which will heavily influence your stability.
It will be even worse with the CONNECT or Prime because now you are talking about broadcast MPEG-2 video which (in the USA at least) can top over 20 Mb/s. Even my latest Ubiquiti AC APs struggle with this at peak usage time. Again - this is not about your wifi network being able to handle 20 Mb/s - of course it can - but maintaining that steadily for hours on end with no hiccups is quite a different story.
Now it is possible that the newer thermal considerations are helping keep the hardware cooler during transcoding operations - I actually had this problem with the original EXTEND and after I moved it outside my server closet where the ambient temp was much more reasonable I get almost no issues with stuttering, etc. But this has nothing to do with the WiFi.
Bottom line here - use WiFi at your own peril - it is far more likely that your network will be the issue rather than the SD hardware or Kodi.