Yeah sorry, I posted just as an example. :) My bad haha! but for sure, I will just take it out of the case and see while playing a video from LAN, the temperature (my SoC is set to overclock BTW, I'll disable this)
Like you said, air is not a good heat exchange the metal case will get a little bit hotter from the air, but not enough, there will be hot air in the case, as there is no flow (or really small amount maybe near connector)
Last time, I remember when I touched the LAN chip it was hot.
I'll test this this week when I'll be back home,