Question How can I convert 4 pin Nzxt Aer P140 fan into 2 pin Psu fan?

[GunslingeRoland]

I’m trying to replace my noisy psu fan with something better. But there is a problem. Nzxt fan cables all 4 of them are black so I have no idea which 2 cables should i connect to the 2 pin connector.

These are the pictures of connectors

 

[tennis2]

The wires are standard. Simply Google 4 pin fan cable and find a pic of one with colored wires for reference.

You can test with a 9V battery.

 

[Paperdoc]

In your first photo, turn the connector over to see the two ridges on the other side. These are beside the holes frr Pins 1 and 3, with the Pin #4 hole beyond the ridges. Now, Pin #1 is Groiund, and Pin #2 is the +12 VDC supply to the fan. Those are the two lines you need to connect. On the old fan, the BLACK is Ground, RED is +12 VDC. On the new fan, you do NOT connect either of the wires from Pins 3 and 4, but do not leave them loose. Cut those two shorter and insualate the ends separately, then ensure they are tucked safely aside so they cannot get cought in someting inside the PSU.

You MIGHT want to consider this factor, though. The AER P140 is a 4-pin PWM style fan which CAN be controlled simply by varying the voltage supplied to it, and that is what the PSU's internal control system will do. But that's not quite ideal, and instead you could use an older 3-pin style of fan for this job. Connections would be exactly the same. In fact, on a 3-pin fan the wires will be coded differently: Pin #1 Black Ground, Pin#2 Red +12 VDC, Pin #3 Yellow speed.

 

[GunslingeRoland]

Thanks for the replies. Turns out my psu couldnt drive enough power to spin nzxt fan. It was spinning really slow so I ended up buying a new psu to use in my new build and save myself from all the trouble. I might buy another 3 pin fan in the future as paperdoc suggested to replace the fan in my old psu to use it in my old build.

 

[Paperdoc]

Well, the slow turning of the fan in the old PSU may not be because it could not supply that power - such a situation would be rare. But many PSU's do their own fan speed control internally, so MAYBE what really was happening is that the PSU thinks it only needs modest cooling because its internal temperature is OK, and is deliberately running the fan slower than max. The noise of the worn-out older fan is not part of that discussion, however. It still needs replacement. So your plan to replace with a 3-pin model and re-use the PSU seems good.