Question 3 intake fans acting as one

[Eamonn100]

When my front 3 intake fans on my PC come on, only the bottom one runs continually. The other 2 just start up, spin at the same speed as the bottom one for approximately 15 secs and then come to a stop. Then start up again.... constantly repeating this cycle as long as the PC is on.

How do I get it so the 3 fans work together at the one speed. I don't want fans to be starting and stopping cycle for ever,. Something is bound to wear soon.

 

[CountMike]

When my front 3 intake fans on my PC come on, only the bottom one runs continually. The other 2 just start up, spin at the same speed as the bottom one for approximately 15 secs and then come to a stop. Then start up again.... constantly repeating this cycle as long as the PC is on.

How do I get it so the 3 fans work together at the one speed. I don't want fans to be starting and stopping cycle for ever,. Something is bound to wear soon.

Are they all connected to same header and all same ?

 

[Paperdoc]

You describe a fan being fed a speed signal to run too slow so that it stalls. When that happens the normal response of the fan header is to send the fan a full-speed signal to re-start it. When it DOES re-start, then the header returns to its previous state, which too often is the SAME speed signal that caused the stall. Repeat. The stall and resulting re-start can happen only if the fan is the only one connected to a particular header, since the header can only monitor ONE fan's speed signal returned to it. So you must have those fans plugged into individual mobo headers.

How to fix. For EACH of the fans that stall like that, go into that header's configuration screen. Look at the "fan curve" of what speed the fan should run for what temperature. For the lowest one or two points on that graph, raise the minimum speed setting so that it will not stall. Remember to go through the Exit Menu to SAVE and reboot.

 

[Eamonn100]

Thanks that sorted it. I upped Fan 2's RPM, from 200 to 500... and all are work together now.

Could someone look at my fan settings and suggest "normal"/common settings.

https://imgur.com/a/OPHkFcP

View: https://imgur.com/a/OPHkFcP

"Fan 2" is three intake fans and "Fan 3" is 2 outtakes.

Are they all connected to same header and all same ?

Yes

 

[Paperdoc]

I presume all these fans are connected to a SYS_FAN or CHA_FAN header. Here are common settings to have their speed controlled automatically by the mobo according to the temperature actually measured by a sensor on the motherboard (NOT the sensor inside the CPU chip).
Profile (how it decides what speed for what temp) to Standard or Normal
MODE set to PWM if all your fans are 4-pin PWM type; if they are 3-pin Voltage Control type set to Voltage or DC, not to PWM or Auto
IF you can choose temperature sensor, set to motherboard, not CPU
IF you can choose to allow the fan to stop at low temperatures, do NOT allow it to stop
IF you can choose to receive an alarm message if the fan FAILS, set that to Yes, get a warning message