Question How do I lower case fan speed using a fan controller?

[DroP90]

I have 6 fans connected to a controller (image bellow), and the controller is connected to CPU OPT in my mobo

My 2 AIO fans are connected directed to the CPU FAN with a splitter

I've been using this controller for 1 year, first with my previous build (i7 10700) and since august with my current one (R7 7700), my case fans always ran at lower speed and noise until a few days ago. I boot my PC and they were loud, full speed, I reboot and fixed, but after a few days the problem came back.

Today I opened my case and changed the connection from SYS_FAN to CPU OPT, I did this because it was how I used with my i7, and even tho it was running fine connected to SYS_FAN until the problem started, for some reason my mobo wouldn't recgonize my case fans through the BIOS.

After changing the connection, it boot running at low speed again, with my BIOS recgonizing the controller, running at ~800RPM just like my CPU_FAN.

Until I tried to update my AMD chipset to deal with another problem I been having, mid install my fans started to run at 1800rpm again, very loud and annoying.

What bothers me is that until very recently my case fans always ran at low speed, both with my i7 and my Ryzen, connected to both CPU OPT and SYS FAN, so there's some culprit changing the speed on my mobo.

I tried to troubleshoot messing with QFAN options on my BIOS and using Armoury Crate, to no results, even tho my mobo recgonize the CPU OPT Fan connected, I can't configure it like I can with CPU Fan and Chassis Fan (note that previously connected on SYS FAN it wouldn't appear on the BIOS, so it was the same 0 RPM for 3 options)

 

[drea.drechsler]

I have 6 fans connected to a controller (image bellow), and the controller is connected to CPU OPT in my mobo

My 2 AIO fans are connected directed to the CPU FAN with a splitter

I've been using this controller for 1 year, first with my previous build (i7 10700) and since august with my current one (R7 7700), my case fans always ran at lower speed and noise until a few days ago. I boot my PC and they were loud, full speed, I reboot and fixed, but after a few days the problem came back.

Today I opened my case and changed the connection from SYS_FAN to CPU OPT, I did this because it was how I used with my i7, and even tho it was running fine connected to SYS_FAN until the problem started, for some reason my mobo wouldn't recgonize my case fans through the BIOS.

After changing the connection, it boot running at low speed again, with my BIOS recgonizing the controller, running at ~800RPM just like my CPU_FAN.

Until I tried to update my AMD chipset to deal with another problem I been having, mid install my fans started to run at 1800rpm again, very loud and annoying.

What bothers me is that until very recently my case fans always ran at low speed, both with my i7 and my Ryzen, connected to both CPU OPT and SYS FAN, so there's some culprit changing the speed on my mobo.

I tried to troubleshoot messing with QFAN options on my BIOS and using Armoury Crate, to no results, even tho my mobo recgonize the CPU OPT Fan connected, I can't configure it like I can with CPU Fan and Chassis Fan (note that previously connected on SYS FAN it wouldn't appear on the BIOS, so it was the same 0 RPM for 3 options)

What motherboard do you have? In fact, include total system spec: mobo, cpu, memory, gpu, drives, case, fans.

I use only BIOS (Q-Fan) for setting fan speed and use the motherboard fan headers only.

I don't know what that RGB hub and fan controller is but hopefully it came with some instructions.

 

[DroP90]

What motherboard do you have? In fact, include total system spec: mobo, cpu, memory, gpu, drives, case, fans.

I use only BIOS (Q-Fan) for setting fan speed and use the motherboard fan headers only.

I don't know what that RGB hub and fan controller is but hopefully it came with some instructions.

MB is a TUF B650M PLUS, my setup is: Ryzen 7 7700, 32GB DDR5@5600, Lian Li O11 Dynamic Mini, CoolerMaster Sickleflow 120 RGB PWM.

I don't know if my controller has PWM, there's only 2 connections, in theory for FAN PWM and FAN IN (looked on mobo manual), it doesn't cover FAN PWR and GND, I don't know about this stuff really.

look how it only has 2 pins under PWM

But anyway, I opened the case and trie to reconnect the controller to the CPU OPT header, didn't worked, so I tried to connect to CHA FAN but couldn't due to cable lenght, would need to open everything and I'm not in the mood for this, so connected to CPU OPT again and... it's running at lower RPM again, low noise.

I don't know why this is happening anymore, just hope it doesn't bug again, it sucks to have your PC sounding like a jet engine.

 

[drea.drechsler]

MB is a TUF B650M PLUS, my setup is: Ryzen 7 7700, 32GB DDR5@5600, Lian Li O11 Dynamic Mini, CoolerMaster Sickleflow 120 RGB PWM.

I don't know if my controller has PWM, there's only 2 connections, in theory for FAN PWM and FAN IN (looked on mobo manual), it doesn't cover FAN PWR and GND, I don't know about this stuff really.

look how it only has 2 pins under PWM

But anyway, I opened the case and trie to reconnect the controller to the CPU OPT header, didn't worked, so I tried to connect to CHA FAN but couldn't due to cable lenght, would need to open everything and I'm not in the mood for this, so connected to CPU OPT again and... it's running at lower RPM again, low noise.

I don't know why this is happening anymore, just hope it doesn't bug again, it sucks to have your PC sounding like a jet engine.

Fan Power and Ground into the controller board would be provided from the SATA power connector. I think that boards mostly useful when trying to set up custom RGB color displays with RGB fans. If not doing that, it's better to just ignore it.

Using the CPU OPT connection should work. Go into BIOS, open the Fan Custom Control screens (I think pressing F6 does it, it did on my B550M Tuf). In that screen change control for the CPU Opt header to PWM and use a temperature sensor that's logical for it to follow: usually that's CPU temperature. Then set a curve that speeds up the fans to what you like (noise-wise) as a baseline, speeding them up as the CPU temperature increases.

In my experience, Armoury Crate is a flaming trash heap. Probably dangerous, even, as it might be mucking around with fan settings you make in BIOS and the reason it seems so messed up. I'd strongly suggest uninstalling it and disabling/removing all of it's services after setting motherboard LED colors/brightness to what you like. Make all fan settings in BIOS instead.

 

[DroP90]

Fan Power and Ground into the controller board would be provided from the SATA power connector. I think that boards mostly useful when trying to set up custom RGB color displays with RGB fans. If not doing that, it's better to just ignore it.

Using the CPU OPT connection should work. Go into BIOS, open the Fan Custom Control screens (I think pressing F6 does it, it did on my B550M Tuf). In that screen change control for the CPU Opt header to PWM and use a temperature sensor that's logical for it to follow: usually that's CPU temperature. Then set a curve that speeds up the fans to what you like (noise-wise) as a baseline, speeding them up as the CPU temperature increases.

In my experience, Armoury Crate is a flaming trash heap. Probably dangerous, even, as it might be mucking around with fan settings you make in BIOS and the reason it seems so messed up. I'd strongly suggest uninstalling it and disabling/removing all of it's services after setting motherboard LED colors/brightness to what you like. Make all fan settings in BIOS instead.

I don't have the option of setting fan curve for CPU OPT, only CPU FAN, which I tried but didn't affect

But like I said, it's back to lower RPM now, this is completely random so I just hope it won't bug again

 

[drea.drechsler]

I don't have the option of setting fan curve for CPU OPT, only CPU FAN, which I tried but didn't affect
...

Hah..yah now I remember. I hate ASUS; the CPU Opt header was strange for my B550 TUF too. I seem to recall it was a fixed +12V though. That's good for AIO pumps that should be run at full speed all the time (what I ran on it) but doesn't explain why your fans are at lower RPM on it.

I hate when things behave in ways I don't understand and would work at it more to find out what's happening. But if you're happy, don't upset the apple cart as they say.

 

[CountMike]

CPU_OPT parallels CPU_FAN settings, it's just split in 2 headers to provide more power for fans, 1A each. Providing that all fans connected to those headers are same they will turn at same RPM.
It's AIO_PUMP that has only full speed but can detect and report RPM.
Should not connect motors of radiator fans or pump (if separate) to hub together with system/chassis fans. only (A)RGB. Radiator fans should be connected to CPU_FAN as you want those to react to CPU temperatures only. Pump connection according to AIO's configuration and if it's adjustable or not.