[SOLVED] Troubleshooting fans on new ITX build

AntAC

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Nov 10, 2014
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Hello everyone,

I've completed a new mini ITX build today, but I'm having issues getting the fans to work correctly. Here's my parts list:

https://pcpartpicker.com/list/r3DYZR

I'm using only one of the CPU cooler fans, it's a 3 pin fan plugged into the CPU_FAN1 connector. I'm also using two case fans which are connected to a PWM controller that I pulled off my old Phanteks Enthoo Pro case. The PWM controller is plugged into the CPU_OPT connector.

Here are my problems:

  • The CPU fan runs at ~1300 RPM at all times regardless of what I change in the UEFI or the current load. I originally set it to silent then to full speed, and no change to the RPM occurred (reset multiple times). Originally, I had both CPU cooler fans connected through a splitter, but when I did that the UEFI didn't acknowledge the fans were plugged in (though they did run at a constant rate).
  • The case fans also run at a constant speed (I'm guessing around 50%), but the UEFI doesn't show that anything is connected. I've tried changing the CPU_OPT mode between auto, DC, and PWM. The only thing that happens when I change this setting is the fans run at a higher RPM on auto/DC.
  • Plugging the fan controller into the CHA_FAN1 connector results in the fans not running at all.
  • I did a graphics benchmark, and as far as I can tell only the GPU fans increased their speed.
Any thoughts on what I'm doing wrong here? I basically tried to mimic the fan setup of my previous build, which I cannibalized the CPU cooler, one of the case fans, and the PWM controller from. Trying new configurations has been hard because of the size of the cooler, but I have a smaller cooler coming.

Thanks
 

AntAC

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Nov 10, 2014
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Alright, I've solved one of the two problems. The Phanteks hub has six slots for fans, and it bases the speed for the other five on what's in slot 1. I didn't have anything in slot 1 so I guess it just defaulted to full speed. I've put a fan in slot 1 and now it seems to be behaving normally.

My new cooler comes tomorrow and the fans that come with it are 4 pin so I'm hoping that solves my other problem.
 
As I recall from a previous NH-D14 cooler, noctua includes a y splitter so both fans can connect to a single main cpu fan header. I think it is pwm.

Then Let me relate to you an issue I had with a Asrock motherboard(different from yours) that I used on a build for my son.
I had a pair of 3 pin case fans that always ran at full speed.
Nothing in the bios let me control the speed.
The asrock documentation said nothing about this.
Normally a 3 pin fan fits in a 4 pin pwm header just fine.
I finally figured out that I needed the front fans to be pwm controlled.
I bought a pair of noctua pwm case fans and all ran well.

I do not know what your Phanteks controller does so I can't help there.
 

AntAC

Reputable
Nov 10, 2014
13
0
4,510
1
Alright, I've solved one of the two problems. The Phanteks hub has six slots for fans, and it bases the speed for the other five on what's in slot 1. I didn't have anything in slot 1 so I guess it just defaulted to full speed. I've put a fan in slot 1 and now it seems to be behaving normally.

My new cooler comes tomorrow and the fans that come with it are 4 pin so I'm hoping that solves my other problem.
 

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