Controlling PSU speed when all fan headers are used

[Martin-Andersen]

I have the SUPERMICRO MBD-X7SPA-HF-D525-O motherboard with passive cpu cooling.
It's a small intel atom based motherboard used in my home build NAS

I am using a small case with 2 fans, one in the front and one on the top. The need to work as pair to cool down the disks.

My problem is that I need to control the PSU to. The PSU is from NorthQ and I don't know how to connect it and it's running to fast.

From the the SUPERMICRO manual:

"Fan Headers

The X7SPA and X7SPE series has two fan
headers. Fan1 is the CPU fan and Fan2
is for the system cooling fan. These fans
are 4-pin fan headers. However, Pins 1~3
of the fan headers are backward compatible
with the traditional 3-pin fans. (Note:
Please use all 3-pin fans or all 4-pin fans
on a motherboard. Please do not use
3-pin fans and 4-pin fans on the same
board. Refer to the table on the right for
pin definitions.
Note: The speeds of 4-pin (PWM)
fans are controlled by Thermal Management
via BIOS Hardware Monitoring
in the Advanced Setting. (The
default setting is Disabled.)"

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[makkem]

Hi
Normally it is not possible to control the PSU fan as it is controlled by the PSU itself.

 

[Martin-Andersen]

Hi
Normally it is not possible to control the PSU fan as it is controlled by the PSU itself.

Thanks. Just uploaded some pics. I think that the 4 small wires are for controlling the PSU fan speed, what do you think?

 

[makkem]

I don't think those are fan speed cables for a couple of reasons.
The fan is working,if those were fan control cables the fan would not work if they are disconnected.
They are not fan connectors,you cannot plug them into the motherboard or fan controller.
The graph on the side of the psu shows that the fan is controlled by the psu and starts ramping up the fan speed at 60% load.

Also I don't know of any power supply that has a fan controlled by the motherboard for the simple reason that the motherboard does not monitor the psu temperature.

 

[Cristi72]

Hello,

Is there an USB plug at the back of the PSU? Because I have not seen a PSU with an USB port other than for charging +5V devices or acting just as a bypass device.

 

[Martin-Andersen]

Hello,

Is there an USB plug at the back of the PSU? Because I have not seen a PSU with an USB port other than for charging +5V devices or acting just as a bypass device.

Yes you can charge a usb device in stand by mode

 

[Cristi72]

Hello,

Is there an USB plug at the back of the PSU? Because I have not seen a PSU with an USB port other than for charging +5V devices or acting just as a bypass device.

Yes you can charge a usb device in stand by mode

The USB is acting just as a bypass device, it's not logically wired in any way with the PSU's controller, so unfortunately you cannot use some software to control the fan speed.

You could change the PSU fan with another fan and plug it into the motherboard (you should be able to fit any 140-mm fan), but you will not have any temperature control for the PSU, which is much worse than the noise.

 

[Martin-Andersen]

Thanks for helping me out. No I can put this issue at rest