Question AIO CPU Fan keeps turning off

[Snow93]

Hello Everyone,

I'm really stumped, I've got an issue with my AIO CPU fan. So the fan works fine and when doing a stress test with prime 95 the fan works exactly how its supposed to and keeps the temp down which is wonderful (First Image). However when I start up games the CPU fan decides to start turning off and on, I've updated the bios, reinstalled the AIO system changed the curves. I am at a total loss as to why the fans only turn off when I open any games on the PC. The second image shows the fan no longer being there.

The AIO cooler system I have was purchased Feb this year (Cooler Master MasterLiquid ML120L V2 RGB CPU Liquid Cooler)

Motherboard - B550 Gaming Plus
CPU - AMD Ryzen 9 5900x
GPU - RTX 3060ti

I hope someone knows a fix however all input is appreciated.

Kind Regards

Stephen

 

[Paperdoc]

The problem likely is in where things are plugged in, and how those fan headers are configured. And I see that the manual for the AIO system is not clear on these items.

You have not mentioned the LIGHTS in the system, so I will concentrate solely on the MOTOR cables.

For the PUMP unit, its motor cable must go to your mobo's PUMP_FAN1 header - see p. 26 (upper right) and 38 of your manual.

For the RAD FAN, its motor cable must go to the CPU_FAN header (also upper right on the mobo).

For all Case Ventilation fans (you are not posting about these), they must go to any of the six SYS_FAN headers.

Now to the details of header configuration settings in BIOS Setup. You must enter BIOS Setup at a boot-up. To do that, as soon as you push the power button HOLD DOWN the "Del" key until the BIOS Setup opening screen appears. See manual p. 49. The manual does NOT give details of the many options. You need to find the screens for configuring the several fan headers. Set them this way.

CPU_FAN set to Normal Profile and to PWM Mode - not to Auto or Voltage or DC. IF it has any option to allow the fan to STOP, do NOT let it stop any time.

PUMP_FAN1 set also to Normal and PWM. IF there is an option for use as either a PUMP header or a FAN header, ensure it is set to PUMP.

SYS_FAN headers also set to PWM Mode (IF you are using 4-pin case fans) and NOT to DC Mode. Use the Normal Profile. IF there is a choice about which TEMPERATURE sensor to use, set that to the motherboard one, NOT to the one inside the CPU chip. NOTE IF your case fans are older 3-pin models, set their SYS_FAN header MODE to DC.

When set up this way, the PUMP will always run full speed as it is designed to do. IF it ever fails you will get a prominent warning on your screen and the system MAY shut down quite soon to prevent CPU overheating with NO cooling system working.

The RAD FAN speed will be controlled automatically by the temperature sensor inside the CPU chip and it should never stop.

Any Case Fans connected to SYS_FAN headers also should be automatically controlled, but using for reference the sensor on the mobo.

 

[JohnBonhamsGhost]

However when I start up games the CPU fan decides to start turning off and on

you have actually witnessed this fan stop spinning
or you are just going by the fact that this MSI software doesn't recognize the fan at certain times?

this MSI software seems to be glitching pretty severely;
losing data from all connected devices
and losing the CPU fan completely.

if reinstalling the software doesn't fix the issue;
check the MSI support forums for others having issue with this version of the control software,
try an earlier version if nothing helpful appears,
contact MSI support directly and see what they recommend.

 

[Snow93]

you have actually witnessed this fan stop spinning
or you are just going by the fact that this MSI software doesn't recognize the fan at certain times?

this MSI software seems to be glitching pretty severely;
losing data from all connected devices
and losing the CPU fan completely.

if reinstalling the software doesn't fix the issue;
check the MSI support forums for others having issue with this version of the control software,
try an earlier version if nothing helpful appears,
contact MSI support directly and see what they recommend.

I witnessed it both in the software and also visually in the case

 

[Snow93]

The problem likely is in where things are plugged in, and how those fan headers are configured. And I see that the manual for the AIO system is not clear on these items.

You have not mentioned the LIGHTS in the system, so I will concentrate solely on the MOTOR cables.

For the PUMP unit, its motor cable must go to your mobo's PUMP_FAN1 header - see p. 26 (upper right) and 38 of your manual.

For the RAD FAN, its motor cable must go to the CPU_FAN header (also upper right on the mobo).

For all Case Ventilation fans (you are not posting about these), they must go to any of the six SYS_FAN headers.

Now to the details of header configuration settings in BIOS Setup. You must enter BIOS Setup at a boot-up. To do that, as soon as you push the power button HOLD DOWN the "Del" key until the BIOS Setup opening screen appears. See manual p. 49. The manual does NOT give details of the many options. You need to find the screens for configuring the several fan headers. Set them this way.

CPU_FAN set to Normal Profile and to PWM Mode - not to Auto or Voltage or DC. IF it has any option to allow the fan to STOP, do NOT let it stop any time.

PUMP_FAN1 set also to Normal and PWM. IF there is an option for use as either a PUMP header or a FAN header, ensure it is set to PUMP.

SYS_FAN headers also set to PWM Mode (IF you are using 4-pin case fans) and NOT to DC Mode. Use the Normal Profile. IF there is a choice about which TEMPERATURE sensor to use, set that to the motherboard one, NOT to the one inside the CPU chip. NOTE IF your case fans are older 3-pin models, set their SYS_FAN header MODE to DC.

When set up this way, the PUMP will always run full speed as it is designed to do. IF it ever fails you will get a prominent warning on your screen and the system MAY shut down quite soon to prevent CPU overheating with NO cooling system working.

The RAD FAN speed will be controlled automatically by the temperature sensor inside the CPU chip and it should never stop.

Any Case Fans connected to SYS_FAN headers also should be automatically controlled, but using for reference the sensor on the mobo.

As far as I can tell all the connectors are in the correct header and the only other fan within the case was case fans so there was no element of control over them, I'll take another look just to make sure I've not put them in incorrectly. It would be my understanding that if it was in the wrong header it wouldn't work at all ?

 

[Paperdoc]

Well, no. If you were using the wrong headers you can get odd behaviour, but NOT likely NO operation. But do note that the configuration settings I recommend are important, and you were given NO good info on these from the mobo manual or the AIO system manual.

 

[Snow93]

Well, no. If you were using the wrong headers you can get odd behaviour, but NOT likely NO operation. But do note that the configuration settings I recommend are important, and you were given NO good info on these from the mobo manual or the AIO system manual.

Ahh right sorry I thought it didnt work entirely, I'll go reinstall it again and double check my headers