Just for some reference info on the 12V connector

just connected my noctura fan with the noise limiter. Works good, but I seem to hear it slightly pulse.. even though it's not a PWM fan and the header isn't pwm either. Any ideas?

This is how you connect any 3- or -pin fan to TPi2:

I think this might be because I stuck two limiters before the fan. I like how quiet it is, but unsure if it's a good idea?

The fan can potentially struggle a bit if you lower it the voltage too much. This is only a guess, though, I haven't noticed anything like this, but I also haven't stacked the "low noise" cables

Another possible: Amazon FBHDZVV 4 PCS SATA Power Splitter Y Cable 1 to 1 15 Pin Male SATA to Sleeved 3 Pin/4 Pin PMW 12V PC

Is there any way to stop the power to the 12v header once node 1 has been powered off ?

There is - if you turn off all of the nodes using

key1

or power button in the case (if you are using any). There's a bug with other ways to control the power (like web interface) that will not turn off the PSU with the last node turned off. We'll fix it soon with the CE firmware

Thank you

Interesting

Yeah found out noctura recommend only one limiter per fan Doubling them up works but is a bit dodgy

Good to know, thank you

Just to clarify: the 12v fan 2 pin header is just a fixed DC supply (no PWM or voltage variation on the 12v pin)?

The fan header can have 2-4 pins: 1. ground 2. +12 V 3. RPM/taho (this was the controller knows fan speed) 4. PWM (this way the controller controls fan speed) So: 2-pin header: only has power pins 3-pin header: has power pins and can report own speed 4-pin header has power pins, can report own speed, can be controlled There is also an old standard where you could control fan speed by the voltage on the power pins, but this is not used in the TPi2

thanks for clearing things up

Can the 12v FAN header be used to power an external PWM controller for fans on multiple CM4? How much power can this header supply? I have 2 CM4 so far, and intend to use these heatsink/fan combo. https://www.amazon.com/dp/B0B4HCL62K?_encoding=UTF8&psc=1&ref_=cm_sw_r_cp_ud_dp_7RFVWGZXD5HFN44XWWBE

Yes it can. It can supply up to 2A

Any update on the 4 pin fan pads with no pins soldered?

What update do you mean? This one is not populated and is not working.

Got it. I though I read somewhere that it may be enabled in soft/firmware at some point to support a case PWM fan.

It cannot since there's more unpopulated parts than just the connector.

Got it. Thank you for the clarification 🙏🏻