Question about selecting a case and temperature for lite duty

[Road Hazard]

I setup a Raspberry Pi 3 Model B for a friend. The -only- thing it will be doing is acting as a DNS server. Right now, it's just sitting in the open with no case or heat sinks. Using wlan0 with no USB devices plugged in. Fairly generic setup and it's running Raspbian Lite.

I was doing a TON of reading about selecting the right case and whether heat sinks would be enough or getting a standard case (drilling a hole or two in the top) and wiring a brush-less 80mm case fan to it would keep things cool.

Seems the CPU and LAN/USB controller are the sources of heat. If I'm not using any USB connectors and this will PROBABLY be kept on wifi, would this help to keep the heat down? Or, these two chips generate heat when the board is powered up regardless of being used?

While I was testing things out, the temperature reported back from the board measured around 50C. If I enclose this in a case, I'm guessing this will go up 5C? 10C?

Is a standard case (with no heat sinks and no fans) good enough to prevent this thing from overheating or should I attach some small heat sinks to the CPU and LAN/USB controller and THEN toss it all in a $10 case? (This one at MC doesn't specifically mention the Pi 3 Model B, but will it work? http://www.microcenter.com/product/4612 ... ry_Pi_Case ) For ABOUT the same price, I could just order a BIQU or Flirc case. I like the BIQU one since it has that little 'bump' on the bottom to catch the chip underneath the Pi 3.

Thanks

[W. H. Heydt]

I would use the RPF case and not worry about a heat sink at all.

[rpdom]

I have small heat sinks on the just SoC (main chip) all my Pi3Bs just in case. They are all in the official cases. They handle a fair bit of load (probably more than a DNS server) and I have no problems with heat.

If 50°C uncased is what you are getting you don't have to worry at all.

[runboy93]

Around 10 dollars aluminum case (Biqu, unistorm...) is best you can bought and no need to worry about temperature anymore.

Just use grit 320 sandpaper with it and put thermal pad (or anything that is 1mm thick, or there will be gap)