CPU fan with 3pins?
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Solved by FizzyFantom,
The 4 pin CPU fan will work if plugged into a 3 pin connector, whether it be on the motherboard or another fan controller. The 4th pin is for PWM and only functions to slow the fan using Pulse Width Modulation, rather than actually supplying the fan with power. 3 and 4 pin fans will happily run without the 3rd and 4th pin, as the 12V power is supplied through the first two pins.
Your motherboard will most likely have a 4 pin CPU fan header which should be able to control it sufficiently (but if it has a 3 pin one it will work fine as I said). The motherboard will probably complain of CPU fan failure if you don't connect it, but this can (mostly) be turned off. Make sure your fan controller can alert you to fan failure and you will be fine.

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