Question B660m pro as cannot set fan below 1800 rpm ?

Sep 21, 2022
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Sorry, My English is pretty bad
I have a main B660m pro as with fan intel gen 12 RM1 https://www.intel.vn/content/www/vn/vi/support/articles/000089190/processors/intel-core-processors.html
I see fan works by manufacturer 600<fan<3150
But my main limited cannot set below 1800 rpm, i try setting in BIOS failed ( i try set custom temperature still can't), i used plan soft A- Tuning used Start FAN test ( it is alike Fan tuning BIOS), it is same result BIOS
I don't know if it's a bug or a feature
1. a-tuning
https://anh.moe/i/wFXwS
2. minimum speed fan
https://anh.moe/i/wFzQV
3. maximun speed fan
https://anh.moe/i/wF1x6

i don't know my main or my fan is it bug ?
 

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