Noctua NF-A4x10 24V PWM for replacement controller fan?

I’ve seen people say that they replaced the controller fan on the SMO with the Noctura 12v but had to add an extra bit since the controller is 24v. I see that Noctura has a 24v 40mm fan now and am wondering if anyone has had success with it?
've been trying to use it myself with their 2-pin adaptor that came with the fan but I can’t seem to get it to turn on.

This is a new mount for the fan that includes a mount for a buck converter.

Yes, I’ve seen that, I am aware that people have been using the 12v with the buck. I was hoping by getting the 24v fan I could circumvent having to do the extra step, so I am wondering if anyone has had any success with doing that?

Is the fan 10 or 20 mm wide? If it is 20mm, you will need to print a replacement panel for the back of the power supply but I have no doubt it will work.

One thing that you may need to try is to reverse the polarity of the wires on the JST connector.

It’s this one:

I replaced the 3DP head fan with a 30mm fan (, and I had to swap the polarity of the wires. It looks like the controller is a 40mm fan, but I didn’t take it apart to verify.

I was disappointed that the fan wouldn’t run at all originally; I was expecting it to run backwards if wired incorrectly. Since I bought a 4 pack, I just altered one to see if it worked, and it did.

That worked like a charm! Thanks a lot :slight_smile:

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