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H100i PRO Fans won't work properly with custom fan curve


LaserEduard
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Hi,

 

my H100i fans won't work properly with a custom curve.

 

This is my curve: https://imgur.com/a/biOPxML (But in the end, it doesn't really matter because no custom curve works the way it should).

 

When selecting the profile the fans are revving up very loud for a few seconds and then just won't turn on again and stay at zero rpm. Even if the temps go over 40c. If I set the speed to a fixed rpm speed the fans will only spin with about 400/500 rpm, even if I set them to 1.000 / 1.500 or more rpm.

 

Everything is connected properly. I'm using a MSI B550 Gaming Edge with a Ryzen 5 5600x. I've set the speed to 100% in the BIOS (Smart Fan Control, every 'point' to 100%. I've tried PWM and DC, both with 100%).

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First - that fan curve isn't really appropriate for a coolant temperature. It looks more like it's designed for CPU temperature.

 

What happens if you use one of the predefined fan curves? Extreme, for example?

 

And ... just to make sure - the fan connectors for both RGB and motor are connected to the pump header? When you say that you see the fans spin at 400/500 RPM, that shows here in iCUE, right?

 

And with the Pro coolers, you don't need to worry about setting the BIOS fan settings at all; that won't make any difference. That's only on the older series of coolers that were powered from the fan controller. The Pro coolers aren't.

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First - that fan curve isn't really appropriate for a coolant temperature. It looks more like it's designed for CPU temperature. [...]

 

Oh okay, that’s good to know! Thanks! Basically what I’m trying to do is, that the fans don’t stop even at lower temperatures and slowly increase the speed with increasing temperatures.

 

The pump is connected to the CPU_FAN1 and to JUSB1 on the mainboard. The fans are connected to the pump via the 2x PWM fan cable from the pump.

 

If I choose the ‘quiet’ curve, the fans start and stop all the time, which is really annoying. With the ‘balanced’ curve the fans spin at around 200-300 rpm in idle and with increasing temperature suddenly jump straight to over 1000 rpm. I can test the ‘extreme’ curve later if you want?

 

Yes, when the fans spin at around 400-500 rpm I can see that in icue.

 

Thanks for the information, very good to know. :-)

 

Also, can you confirm you are using the ML fans that came with the cooler? If not, what are you using?

 

I’m using two Be Quiet Silent Wings 3 120mm PWM fans.

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I’m using two Be Quiet Silent Wings 3 120mm PWM fans.

 

 

Unfortunately, that is the problem. Some of the Corsair controllers don't get on with specific PWM fans. They are all European based manufacturers and it is a relatively select, but popular group among those that really like their fans. BeQuiet SW2 and SW3 PWM models are definitely on the list. Those are a bit wacky with their PWM % curve to begin with, but the lack of control you are describing is the heart of the problem. Other known PWM incompatibilities are with the EK Vardar ER series, Noctua Industrial 3000 rpm PWM (all controllers) and 2000 rpm on Platinum/XT have been reported. Standard Noctua PWM fans work fine.

 

You will need to move the SW3 to the MB headers for control if you want to use them.

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Unfortunately, that is the problem. [...]

 

Wow, I didn’t expect that. I thought PWM fan = PWM fan. Thanks a lot!

 

So, if I want to use the BeQuiet fans, I would have to connect them with a Y-Cable to the CPU_FAN1 connector and the H100i to the PUMP connector on the mb?

 

Generally, is that a good idea or should the fans only be used directly with the H100i?

 

 

Edit: Otherwise, the Noctua NF-F12 PWM chromax.Black.swap would work with the H100i?

 

Edit2: I connected the pump to the PUMP connector, the first SW3 to the CPU_FAN1 connector and the second SW3 to a case fan connector and changed the curve from the second in the BIOS to the same curve of the CPU_FAN1. This seems to work like it should. Thanks a lot!

Edited by LaserEduard
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Wow, I didn’t expect that. I thought PWM fan = PWM fan. Thanks a lot!

 

It should be, but apparently not. I have 80+ fans that belong to that group of non-cooperatives.

 

 

So, if I want to use the BeQuiet fans, I would have to connect them with a Y-Cable to the CPU_FAN1 connector and the H100i to the PUMP connector on the mb?

 

Probably works. Pump does not care if it is on CPU or PUMP. CPU is preferable because it will trigger the BIOS warning if it does not start on system power up. For the fans, it may depend on your motherboard. Many have special rules for the CPU fan header and those were written with an air tower in mind. CPU_Fan can be really twitchy for standard fan control and you don't need that. Any fan header will work. If CPU fan is the convenient one, that's fine but see if your MB has fan delays or hysteresis settings to slow down rapid changes. Radiator fans only need to keep turning at a steady rate to keep pushing the heat out on each pass. They do not need to be reactive to CPU temperature. That part of the cooling is conductive at the block. The fans are simply taking out the trash heat after it is transferred away from the CPU.

 

 

Generally, is that a good idea or should the fans only be used directly with the H100i?

 

My preference, but not essential by any means. It's only been 5 or 6 years since most AIO units went to onboard fan controllers. All the rest of us including those using custom loops find other ways to make things work. The trick is the control variable. CPU temp is not the right one, but often the only choice on the motherboard. The cooler can access coolant temp, which is the correct choice. A possible workaround is to use any 10K thermistor wire to run from a MB temp probe connector (2 pin) and put the sensor end on the radiator exhaust. Exhaust air temp has a direct relationship with coolant temp in the radiator and is a good substitute. Obviously for now, you just want the noise to stop, so put them anywhere on the MB and make do with what you have.

 

 

Edit: Otherwise, the Noctua NF-F12 PWM chromax.Black.swap would work with the H100i?

 

Those should work on the Pro model. I used them with mine and I have used them with my Commander Pro for several years. However, another user recently posted this same issue for them on a XT series cooler. That was a big surprise to me and the first time the Chromax have come up. I do not know if that means there was a manufacturing change or if it is something unique to the Platinum/XT fan controller. If you can confirm you have a "Pro" cooler and not the "Pro XT", I will get mine out of the closet and test. I have some old and new Chromax.

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