All the headers on the Corsair commander are 4 pin pwn, not sure about it but I think it should work with 3 pin fans. The commander comes with 4 external temp sensors that can be used the by slotting in-between the fins of the rads. The difference between that and the water temp shouldn't be more that 2-3 degrees, but the temp rising curve should be the same. You have to use Corsair icue which is far from the best piece of software out there. Hope you understand , English is not my first language