Hello,
this is my first post on this forum. I want to share my experience. I did some tests using small heatsinks on chips and the open case.
I get the following readings from internal sensors in standby (no devices connected on WiFi) with a room temp of 20C:
phy0 2.4Ghz -> 68C
phy1 5Ghz -> 43C
On the SoC the reading by internal sensor is 45C.
The temperatures detected with a thermal scanner (my bet was 3-4C low) are:
on 2.4Ghz -> 37.1C
on 5Ghz -> 40.5C
On the Soc I get 45.5C.
It seems to me that the SW reading by sensor on 2.4Ghz chip is not so correct.
First of all, thank you for the many helpful comments which helped me with my decisions.
In my setup, I deactivated the wifi chip by unloading the mt7915e module, because I don’t need it. This dropped the heat development a bit. I only use the Banana Pi as a gateway for my 1GBit fiber optic connection for netflow traffic analysis.
To do this, I glued individual heat sinks to each chip with thermally conductive adhesive. All packed in a metal case. Drilled a hole in the cover and inserted a 5V PWM fan.
This usually runs at the lowest inaudible speed and is controlled by pwm. The temperature of the CPU is 26°C in a performance/stress test and the SFP connector is 36°C.
What is the OS?
I have also 5V Noctua with PWM and the fan runs for just 5 second during boot and stops after that. What is the reason about that? Thank you.
I’ve only seen heatsinks with fan and 43mm hole pitch using a 12v fan…no 5v fan. Ordered 2 5v pwm fans and heatsinks without holes to drill holes and cut a thread.
I just ordered the Noctua. I’m contemplating to buy a northbridge heat sink and remove the fan to screw the Noctua on the heatsink, if it does not work I’ll do your setup.
If I do that, what is the diameter of the hole you pierced in the case for the fan, and what is the bit size for the drill for the screw holes?
I did something similar. I have mounted a heatsink of about 60x70mm, drilled a 28mm hole on the case and put a 30mm 5v fan in it.
The temperature is now about 33 degrees Celsius (with the room at 20 degrees).
I have now ordered a second BPI-R3 and I think I will do something similar for the fan but will probably use small single chip heatsinks.
I just received the Noctua PWM. There are 4 wires on the fan, 3 on the board. I see that you selected one of the 2 blue wires. Does it matter which one you take?
