Hi,
 
I recently updated my bios. 
 
First I noticed both my cooler fans were not spinning (but one kept trying to spin as if he was receiving power for .1seconds).
 
So I swapped into bios, changed some setting - Set DC power to CHA_FAN1 (which is where it was connected to) and 100%.
 
Swap to windows - can't get the fans to go under 1100 RPM on manual, can't get them below 1350 on auto with curve set to 25% below 40c.
 
So, tried a lot of things - to no avail.
 
IIRC, before I updated the bios, one fan would seize spinning under low load. As it stands currently - both are constantly doing the ~1100 when I have them set up via the BIOS to not spin at >25% for below 40c.
 
So, how do I get them to drop back down below 1100 and let the software take control as necessary and based on the curve I set-up? (I am almost 100% certain one fan is meant to stop spinning if there's no load on the CPU but correct me if I am wrong)
 
I thought it was just a matter of DC+100% in the BIOS for the software to take over? 
 
All help appreciated.
 
 
Example attached 
 
Manual set up, 1100 at "lowest" setting.

K boost is off, it would glow blue if it were on.
 
Can't even enable it (ironically, because now that is broken too it seems - attached image).
 
USB cable was never unplugged :D
 
I haven't changed anything other than BIOS. Which is why I'm so confused as to how I can't get this set-up again.
 
 

• BIOS - Can change the USB setting on MB
  •  How? sorry.
• Was / is it Legacy Mode or UEFI before the BIOS update ?
  •  Not sure. Ran very outdated bios before this - felt it was best to update because of certain volting issues(no OC) with my CPU (should've left it in hindsight)
• Windows Device Manager show any issues ?
  •  None
• Try it with Corsair link - turned Off
  •  Tried it - no changes to anything
• OS details ?
  • Win10 64
• You Logged in as Admin account ?
  • Yes

Motherboard: Asus Prime z370-e
Corsair Link for Ram controls.
Running version 2.0.9
 
I just spent 15mins double checking everything in the Bios.
 
Only 3 fans are controlled via BIOS, all other case fans are controlled via case fan controller and afaik run 900RPM constantly.
 
3fans;
 
2x CLC fans = 1 3pin
1x Exhaust fan =4pin PWM
 
The exhaust fan is plugged into CPU_FAN1 (BIOS Settings are PWM with curve)
 
The CLC fans are plugged into CPU_OPT.
 
As far as I am aware CPU_OPT runs 100% all the time, which is why it recommended in the manual to run watercoolers off it. Plus 3pin CLC cable should cause it to draw 100% all the time.
 
 
 
 
 

• There's a 4-pin AIO_PUMP header on that board, right?

• Yes.
• Connect the pump to that..Connect the fans to the pump..Connect the USB cable to a USB header..Should be no muss no fuss.
  • The fans connect to the CPU cooler via splitter - the cpu cooler only has 3pin leaving it. I'll Plug it into the AIO and we can see how that goes.

 

Now you have it hooked up right.
 
My H80i V2 fans run at 1140 minimum, by the way..Can't even really hear them..Do your fans make noise, or what's the problem with them running at 1200?

ReddPC
Yes, they are extremely clattery. It sounds somewhat like an old HDD reading/writing and it comes and goes. I tested their noise out, once they hit 80% I honestly fear they will break.

I'll probably end up buying 2 noctuas to replace them with at this rate because it honestly sounds like they are getting worse.

Yeah, there ya go..Grab some better fans.