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hw:server:aoostar_r7:fan [2025/02/16 08:37] – created niziakhw:server:aoostar_r7:fan [2025/02/16 13:29] (current) – niziak
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 ===== FANs ===== ===== FANs =====
 +
 +==== CPU FAN ====
 +
 +CPU FAN maintains its lowest ~632 rpm even if PWM is set to 0. So it is not possible to stop CPU FAN.
 +Max noticed RPM: 4300
 +
 +==== Bottom FAN ====
  
 Very loud bottom fan, 2 pin only, connected to 4pin connector on MB. Very loud bottom fan, 2 pin only, connected to 4pin connector on MB.
-  * EVerflow Model: R1292215BL+  * Everflow Model: R1292215BL
   * 92 x 92 x 16 [mm]   * 92 x 92 x 16 [mm]
   * 12V / 0.20A   * 12V / 0.20A
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     * 50.5 CFM     * 50.5 CFM
     * 2200 rpm     * 2200 rpm
 +
 +PWM control is not working. BIOS/MB design is broken ?
 +Workaround is to use CPU FAN PWM to control also bottom FAN.
 +
 +
 +^ PWM %  ^ CPU rpm  ^ Noctua rpm                                ^
 +| 0      | 632      | 0                                         |
 +| 10     | 635      | 0                                         |
 +| 13     | 635      | stop if started                           |
 +| 14     | 635      | cannot start but keep running if started  |
 +| 15     | 635      | cannot start but keep running if started  |
 +| 20     | 637      | cannot start but keep running if started  |
 +| 24     | 632      | starts                                    |
 +| 30     | 790      |                                           |
 +| 100    | 4300     |                                           |
  
 AMD Ryzen 7 5825U  max temp is 95 AMD Ryzen 7 5825U  max temp is 95
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 Description: Description:
-  * Fan OFF: At this temperature the fan remains off. +  * **Fan OFF:** At this temperature the fan remains off. 
-  * Fan Start: At this temperature the fan starts to rotate. +  * **Fan Start:** At this temperature the fan starts to rotate. 
-  * Full Speed: At this temperature the fan will spin at full speed. +  * **Full Speed:** Not related to PWM.  **Over** this temperature the fan will spin at full speed. 
-  * Start PWM: This is the percentage of speed at which you want your fan to start spinning when it reaches the temperature indicated in "Fan Start". +  * **Start PWM:** This is the percentage of speed at which you want your fan to start spinning when it reaches the temperature indicated in "Fan Start". 
-  * Automatic Mode Control: It is very important to set this field to 29, otherwise my fans would never ROTATE. I didn't manage to find out much information about this parameter. +  * **Automatic Mode Control:** It is PWM slope on 1/8th steps. Setting of 8 in BIOS gives value of 64 in ITE8613e chip register (and also linux sysfs). Max in linux sysfs is 127.  
-  * Delta temperature: I haven't found much more information.+  * **Delta temperature:** default is 2 
 + 
 +How to setup CPU fan. To keep fans quiet and not rotating when possible: 
 +  * **Full speed** = 89. To protect CPU. Max CPU working temp is 95. Consider that spin-up of CPU FAN takes time. Mine is ''89'' so if CPU reach ''90'' it goes full speed. 
 +  * **Start PWM** = to 25 (percent). This is because 2nd chasis FAN connected to CPU fan start rotating from this value. 
 +  * **Fan OFF** = 50 
 +  * **Fan Start** = 60 
 +  * **Automatic Mode Control** = 4 (raw value 32)
  
- I asked Aoostar directly about that and got the following response: 
  
-“The automatic mode control value increases, and the entire PWM value goes positive, which can be interpreted as the slope. The delta temperature can be interpreted as the error value. If you want the fan to rotate faster, you can adjust the start pwm or the automatic mode control slope value. Depending on your situation, you have to test them one by one.”