What is the correct fan/pump connection? (Asus Z170-PRO and NXZT X61 Kraken)

otacon1

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Feb 18, 2016
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Going by the official NZXT manual for the X61 Kraken, the 3-pin water pump power cable is supposed to connect to the 4-pin CPU-PWR header on the mobo. The problem is that there is no header on the mobo titled this. There are headers titled CPU-FAN and CPU-FAN2, but no CPU-PWR. There is a header titled W_PUMP.

I connected my water pump power cable to W_PUMP. It has worked fine since I built the computer in early March. However, it gives a BIOS error because it doesn't detect anything at the CPU fan connector. The BIOS message said I could set it to IGNORE in the BIOS settings, so I did, just to avoid that annoying error.

Like I said, the computer runs great with no problems. However, when I try to OC it, it always fails. I think it's because it doesn't detect anything on the CPU fan connector.

Also, I've noticed that the water pump RPM changes, so I think the mobo MIGHT be adjusting this.

So here are my questions:
1. Is my water cooler power cord plugged into the right place? (I think it is.)
2. Should I plug my water cooler radiator fans into CPU-FAN and CPU-FAN2? I followed NZXT's instructions to plug them into an adapter that plugs into a SATA power cord, and that's where they have been this whole time, but their RPM don't seem to vary; I'm sure they're always maxed since they're hard-wired into constant voltage through the SATA connector/adapter.

Here is the manual for my water cooler.

Thank you
 
Solution
Radiator fans, just like fans on air cooler have to be controlled according to CPU temperatures and that comes thru CPU_FAN header, if you want co control them at all and not let them blast full speed all the time.
Pump on the other hand is made to run full speed all the time because fluids can change flow much slower than air and needs to stay in motion to transfer all the heat to rads. By the time water gets to the rad and cools down and than comes back to the block, heat in the CPU can already come to high levels, so it has to be in full circulation. Some MBs have dedicated header for the pump so it's speed doesn't get regulated.
I don't know why yours is not showing RPMs,

otacon1

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Feb 18, 2016
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Alright, when I unplugged my X61 Kraken's radiator fan power cables from the power cable coming from the pump, my BIOS shows the RPM of the radiator fans, but now it doesn't show the RPM of the water pump like it used to. Instead, it just shows N/A now for the water pump data. Why would it matter to the motherboard or water pump where the radiator fans are plugged into, and why would that prevent the BIOS/mobo from showing the water pump data?
 
Radiator fans, just like fans on air cooler have to be controlled according to CPU temperatures and that comes thru CPU_FAN header, if you want co control them at all and not let them blast full speed all the time.
Pump on the other hand is made to run full speed all the time because fluids can change flow much slower than air and needs to stay in motion to transfer all the heat to rads. By the time water gets to the rad and cools down and than comes back to the block, heat in the CPU can already come to high levels, so it has to be in full circulation. Some MBs have dedicated header for the pump so it's speed doesn't get regulated.
I don't know why yours is not showing RPMs,
 
Solution

otacon1

Commendable
Feb 18, 2016
35
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1,530
Alright, thanks. The water pump RPM never changed too much. At most, about +/- 50 RPM or something like that. So it was probably pretty close to being on max even when it did detect the RPM. Still, I wish someone could help me figure it out, since it's highlighted in bright gray in the BIOS, meaning that it DOES detect that there is a water pump connected to it, just that its data is now N/A.