In case you have missed it  – there is a new Raspberry Pi Zero W in town. Since we have a WIFI on board now we should look at the Raspberry Pi Zero W WIFI performance. What should you expect from the tiny board? I’m going to test the chip and see how great it is. And probably answer a question if you can stream from it.

This is a WIFI module with CYW43438 module (the same found on RPI3) supporting the 802.11n. In theory, the 802.11n technology should give you up to 450Mbps. In practice, the chip has a single band support (20MHz) and the expected speeds are up to *72Mbps.

Mobile readers, check the end of this article for a table

*lab scenario, also thanks to u/Thrawed for the edit.

Raspberry Pi Zero W WIFI performance – testing methodology

The idea is simple. I will walk around with the Raspberry Pi Zero W and iperf server running with it and will report back at various distances. The board is loaded with the latest Raspbian Jessie (full). I’m measuring speed between the raspberry and the PC (windows) hooked by the 1Gb Lan cable. The router used is Linksys WRT1900ACS.

1m

The benchmark default. I’m not expecting any surprises. This is mainly to show you what the board is capable. Here are the results:

Raspberry Pi Zero W WIFI performance

Across the floors

Testing distance is about 5m however, the board is on another floor. So there is a ceiling and a wall separating the board from the router. Here are the results:

Raspberry Pi Zero W WIFI performance

10m

Let’s see how the range impacts the data transfer. While my router is powerful, the Raspberry Pi Zero W has a tiny space reserved for the antenna. The router has been placed near a window the board was in the visible range of the router. Here are the results:

Raspberry Pi Zero W WIFI performance

25m

This is where I’m running out of space. I wanted to avoid breaking the line of sight with the router and this is the furthest I can travel without doing so. Since I was trespassing already, I’m pretty convinced that my neighbor from the other side of the road would be able to access my WIFI with Raspberry Pi Zero W. Here are the results:

Raspberry Pi Zero W WIFI performance

 

  1m   (data) every 2 sec 1m (speed) every 2 sec 5m(data) every 2 sec 5m(speed) every 2 sec 10m(data) every 2 sec 10m (speed) every 2 sec 25m(data) every 2 sec 25m (speed) every 2 sec
  8.38MBytes 35.1Mbits/s 7.38MBytes 30.9Mbits/s 4.38MBytes 18.4Mbits/s 2.38MBytes 9.96Mbits/s
  8.50Mbytes 35.7Mbits/s 7.25MBytes 30.4Mbits/s 3.88MBytes 16.3Mbits/s 3.62MBytes 15.2Mbits/s
  8.25Mbytes 34.6Mbits/s 7.12MBytes 29.9Mbits/s 3.62MBytes 15.2Mbits/s 4.12MBytes 17.3Mbits/s
  4.75Mbytes 19.9Mbits/s 7.00MBytes 29.4Mbits/s 3.25MBytes 13.6Mbits/s 4.88MBytes 20.4Mbits/s
  8.12Mbytes 34.1Mbits/s 7.50MBytes 31.5Mbits/s 4.12MBytes 17.3Mbits/s 4.12MBytes 17.3Mbits/s
TOTAL 38.0Mbytes 31.8Mbits/s 36.2MBytes 30.3Mbits/s 19.2MBytes 16.1Mbits/s 19.1MBytes 16.0Mbits/s

As you can see, Raspberry Pi Zero W is capable of fairly consistent transfers especially when the line of sight is maintained. The terrain obstacles will impact the data transfer for sure, but if you keep the line of sight you should have no issues with the connectivity. To answer the stream question, you probably could. But with the 1GHz clock, save this board for other purposes and buy a Raspberry Pi 3.

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