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Maximus X Hero POST Code Temperature Display

AlamoSimon
Level 7
Hi there,
I'm a long time lurker and first time poster so please go easy on me 🙂

I have the following issue with my Maximus X Hero motherboard:

For reference, this is my completed build (https://pcpartpicker.com/b/jX3bt6).

Additionally I have the fan extension card and three temperature sensors (2x water, 1x air) attached to that.

I have the option enabled to display my CPU temperature in the POST code display. In the beginning that worked fine, I missed the ability to display a temperature sensor instead of the CPU temperature but arranged with that.

Now recently, the display changed and showed my air temperature sensor all of a sudden (connected to the extension card's temperature 1 sensor). I can't remember any changed options in BIOS or ASUS software. I was pretty happy and rewired the temperature sensors (on the running computer) so my water temperature sensor was connected to the ext temp 1 header. That worked great.
After reboot, the display shows me the air temperature sensor again (which is now attached to ext temp 3).

I suspect that the display shows the highest external temperature. My air temperature tends to be higher than the water temperature.

My question is now:

1. Why did the temperature display change to external sensors?
2. How do I choose the temperature sensor that is being displayed?

Thanks for your time and effort!
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