A small disparity which rounds to 1% on the display is nothing to worry about. Also, the number on the control card is the readout from the control sensor, whereas the curve is the "instruction". The actual number underneath is a floating point. About halfway through, I manually raise the fan control's activation speed temporarily to force the fan speed to 0%, and after restoring the activation speed the fan speed returns to 27%.įanControl bug - fan speed 1% less than curve speed ( 05-32-02).mkv 213.44 kB The curve speed is steady at 28% and the fan speed is 27%. The behavior is shown in the attached screen recording, which is about 30 seconds long. (Also, the curve's hysteresis is set to 0%.) Hysteresis couldn't explain it, if my understanding of hysteresis is correct, because hysteresis is an internal property of the curve and the fan control sees only the source curve speed. So, tell us the maker and exact model number of the case fans.Is there a reason why a fan control speed would stay 1% less than its source curve speed? The fan control offset is 0%, so the offset doesn't explain it. 3-pin fans on a header using PWM Mode always run full speed. But IF your case fans are of the 3-pin type and IF the headers you plug them into are using only the PWM Mode for controlling them, that will not work. Exactly what fans do you have for case ventilation? You have specified the CPU cooler fan as a 4-pin (PWM type) unit, and that certainly should have its speed under control of the mobo's CPU_FAN header. So all fans start full speed, but slow down shortly thereafter. Then, after less than a minute as the POST sequence completes and the actual measured temperatures from sensors become available, the mobo headers' fan control systems slow them all down to whatever is required at that time in terms of temperature. The normal sequence at start-up time for all fans powered and controlled by the mobo is that they start at full speed always. When you reboot and the fans all come on at full speed, do they stay that way? Or, do they slow down after a short time?
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