Windows overriding bios fan speed

DaddyDeox

DaddyDeox

DaddyDeox

Associate
Joined
28 Oct 2017
Posts
5
Hi Guys,

Running a Gigabyte z370 Aorus Ultra - Rev1 Bios F5

I cant for the life of me fix this issue. The Bios is successfully able to control my case fans, either through voltage control and 3 pin phantek fans directly connected to the MB, or alternatively via CPU fan header in PMW mode via a built in PMW controller that can control multiple 3 pin case fans on the Phantek Evolve ATX... both work fine and as expected. Case fans silent.

As soon as windows boots, something overrides the bios config and runs the fans at 100.

I have tried installing the Gigabyte System Information Tool that includes Smart Fan 5. This isn't able to control the fans in either config. It also seems to suggest that the fan control range is 100%-100%. I have run calibration, nothing changes.

I have tried installing speed fan, and this does not register any fans to control.

CPU temps are 20-30C in windows (although seems like the 8700k fluctuates 10C on some cores, is that normal?) So it doesn't appear that windows load is causing the PWM to kick to 100%. Also the fact the software can control the speed also seems to indicate an issue.

Is there anything that could be overriding the bios? Has anyone experienced this before?

Kraken x62 AOI running fine with low fan and pump RPM and temps. Aorus Extreme 1080ti and Corsair rm850x in fan stop mode due to system idling. Just these case fans going hammer and tongs...

Thank you in advance,
DaddyDeox
 
Well the bios setting is a temp curve that will spin up and down based on temp. And that works ok. There is nothing I have installed other than the Gigabyte software that should do anything different (unless someone knows of something in windows??)That Gigabyte software doesn't seem to be able to control fan speed up or down. Even if I just stick it in full mode, or quiet mode.. no change in RPM from the software. I uninstalled it, but unless is has left some hangover setting in windows I am not aware of then I don't know what it might be.
 
Mostly Solved.

In case anyone stumbles over this in the future.

The PWM hub comes with a sata power connector however this shouldn't be used when connecting the hub to a PWM header as it draws all the power it needs for up to 6 fans from the header. If you do connect the sata power supply too, it causes interference with the speed sensor reporting and causes erratic speed control, not necessarily 100%.
 
dforrest said:
I have exactly the same problem.

DaddyDeox, could you please explain more your reference to a sata connector.

Thanks
Click to expand...

Phanteks have a peculiar fan hub (which behaves in a rather odd way as Daddy explained) which has a SATA power input on it.
 
I have set the temperature curve for both 3-pin and 4-pin fans and it works as it should for 4-pin fans but 3-pan fans run at full speed. The strange thing is the when Windows wakes up from sleep mode, 3-pin and 4-pin fans both work as they should and follow the curve.
 
DaddyDeox said:
Mostly Solved.

In case anyone stumbles over this in the future.

The PWM hub comes with a sata power connector however this shouldn't be used when connecting the hub to a PWM header as it draws all the power it needs for up to 6 fans from the header. If you do connect the sata power supply too, it causes interference with the speed sensor reporting and causes erratic speed control, not necessarily 100%.
Click to expand...

Thanks! this issue was doing my head in
 
dforrest said:
I have exactly the same problem.

DaddyDeox, could you please explain more your reference to a sata connector.

Thanks
Click to expand...

Just make sure the fan hub is not connected to the separate data power connector if you are using a 4 pin PMW header on the motherboard. Bios may also have options to switch between PWM and voltage regulated.
 
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