Heatsink/Fan for VisionFive?

Now that I have my VisionFive operating successfully, I am planning to start compiling code, but notice that the CPU/Memory starts to get a bit hot…
I have seen mention of a heatsink/fan, but cannot find how to obtain one. Are they available for purchase?
Robert Gadsdon.

The fan can’t buy yet,we will providing a link to purchase when the fan is ready to buy.

@rgadsdon that’s the one I got bundled with. The fan itself is kinda noisy so I swapped it with one from Noctua (Austrian manufacturer).
You will find the heatsink/fan also on Alibaba and the like.

Tomorrow I will hopefully receive an 52pi Ice Tower which is actually made for Raspberry Pi3+/Pi4 - likely overkill but at least not a single sign of thermal issues any longer :sweat_smile:

I agree, the bundled fan is not just noisy but emits a highly annoying frequency constantly even if it didn’t have to run at full speed (which it always does).

So before I start working on some GPIO-magic to get something like temperature controlled fancontrol to work I asked myself how well the heatsink of that fan itself would do.

Well, forget it when just attaching it like intended without powering it.

Then again, once I’ve added some Artic MX-4 thermal paste, put the fan on and not powering it, the sink alone left it hanging at just 52C in a 21C room temp after about an hour of:

cat /dev/urandom | zstd -T2 -vc > /dev/null

I call that a win.

Though, I’m not sure what the thermal specs really are… the information seems to be sorely missing to my eyes.

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Small update:

So I used GPIO pin 6 for ground and pin 1 for 3.3V expecting it to drive the fan at a lower speed. Together with the thermal paste it now runs at ~35C +/- 0.1C at 21C room temperature under full load.

The annoying high pitch noise is luckily mostly gone as well.

So yeah, I hope anyone looking for a “poor soul” solution using the stock fan finds this information useful. :stuck_out_tongue:

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@kth5 just out of curiosity: how did you measure the (core) temperature? IR thermometer or any accessible sensor of the board/SoC itself?
Thank you :slight_smile:

I simply installed lm_sensors 3.6.0 and used sensors and got the following:

Adapter: ISA adapter
temp1:        +30.2°C

When I blew on the heatsink without the fan running, it quickly changed for the better so I assume it’s a on-chip temp sensor inside or just under the CPU.

Thanks. Wonder what went wrong the last time I installed lm_sensors as it didn’t detect any sensor :man_shrugging:
Anyway, works now.

Can you provide info on the specific heatsink / fan you’re using? I’m eager to use this board as it’s frankly the only RISC-V board I have where compilers don’t crash at launch / whenever I push the CPU. But, as you said, the stock fan is obnoxious :sweat_smile:

I’m currently using an Enzotech CNB-S1 together with a Noctua NF-A4x20 5V running at 3.3V.

As the cooler is a little bit smaller than the fan I bought a custom aluminium fan mount as well as I wasn’t in the mood for 3D-printing :sweat_smile:

Temperatures never got higher than 30°C. Idle and load seem to be nearly the same around 27°C to 29°C with an ambient temperature of ~20°C:

$ sensors
Adapter: ISA adapter
temp1:        +27.0°C
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This is lovely, thank you! I have to admit I’m pretty new to buying custom kit like this. I found sources for the fan and heatsink, but can you link the fan mount as well? I don’t have a 3D printing setup so that’s not an option for me. Again thank you so much for being so helpful!

Took me a while to find a suitable one as the measures are in no way even near to 40x40mm :sweat_smile:. In the end I contacted a RC car shop and I was offered a custom milled product exclusively for my needs.

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I have used two little fans instead of the one supplied which as infernally loud, though I used the heatsink in which the fan supplied was mounted. See www.whatwasitagain.com - down the page are listed the two fans.

Maybe this has already been answered, but is the two-pin power connector for the fan just a flat voltage or is it adjustable for speed stepping? In other words, could one write a stepper for the fan tied to the sensor’s reported CPU or would that only be possible by plugging it into GPIO instead?

I don’t know for sure, but by external sensations. When I use the Armbian\Altlinux version with the latest core, when the device is turned on, the fan turns on with the highest RPM, but after the system starts, the fan reduces the RPM and works (by ear) quieter than when it is turned on.

By the way, it is a very common misconception to use copper radiators, copper is absolutely useless and even harmful for use in radiators of these devices. The copper radiator has significantly more mass and creates a useless extra load on the mounting device, and has a high price. The difference between copper and aluminum, for heat transfer to air, is completely absent. The only https://forum.rvspace.org/images/emoji/twitter/stuck_out_tongue.png?v=12 important condition is the area of air contact with the radiator surface. If the contact area is the same - copper has no advantages, it is a lie that copper works better for cooling.

According to the schematic, this two pin is connected to the 5v directly and can’t be controlled.

Darn, that’s a shame, especially given the ubiquity of voltage-controlled fans. I guess GPIO or bust if you want stepping control.