So change from Auto to DC, which helped (its a 3 pin 120mm noctua) but it still spins at like 1700rpm. If I plug the old one back in, which is a cooler master, it’s absolutely fine. It’s also a 120mm 3pin.
No idea what’s going on with the Noctua. Gonna flip back to the Cooler Master for now I think.
@kev 3 pin == no speed control.
There is one for rpm reporting + 12V and GND. The speed control comes with a fourth pin.
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