Question ThermalRight Mijolnir 360

[Hnoor]

I have installed the AIO, all fans are working , but i cant control the fan speeds on the radiator nor can i see the 3rd fan in BIOS.

This is causing the two CPU fans that are being detected having completely different speeds.https://ibb.co/vxm5VtvX

image of PC

Details
Mobo : Asrock Steel Legend X670e
AIO : Thermalright Mijolnir 360
Processor : Ryzen 7800X3d

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I went into the bios and changed CPU fan2 to W/pump.
No idea what this does.

Last edited

 

[Aeacus]

Where did you connect the rad fans?

Holy bible of AIOs tells you to daisy-chain the fan power cables and plug them to CPU_FAN header. While also plugging the pump's USB cable to USB 2.0 header and pump's power cable to CPU_OPT/AIO_PUMP.
Do you have it connected as such?

I went into the bios and changed CPU fan2 to W/pump.
No idea what this does.

It should set the W/PUMP header to run 100% at all times, which it should be, IF you have your AIO pump power cable connected there.

 

[Paperdoc]

Aeacus has it all right above. Just two items to add.

IF you have the rad fans connected to CPU_FAN1 as recommended for that board, check a detail of its configuration settings - see the board's Software / BIOS Setup manual, p. 69. Set it as:
Setting to Standard Mode
Control Mode to PWM, not Auto or DC

The AIO PUMP cable should go to CPU_FAN2 on that board. For its configuration set as:
CPUFAN2/WP Switch to Water Pump Mode
Control Mode to PWM
Other settings do not matter much because the Water Pump Mode does NOT try to control the pump speed - it is kept at full speed all the time.

Regarding fan speed readings, you need to realize that any fan header can deal with the speed signal sent back to it from only ONE fan. So when you use a Splitter or a daisy-chain system to connect more than one fan to one header (say, two rad fans to your CPU_FAN1 header) the connection wiring will only send the speed of ONE of those fans to the header for display. You will never "see" the other fan of that group anywhere, and you can assume it is the same. The only impact this has is that the header monitors its fan speed signal to detect possible failure (NO fan speed), and it cannot do that for the "other" fan whose speed is not fed back. So from time to time YOU should just look at the rad fans to be sure both still are working.

Remember that the CPU_FAN1 header shows you the speed of ONE rad fan, and CPU_FAN2/WP header shows you the PUMP speed.