ASRock Taichi AM4 X370 Fan Headers

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   Does anyone know for sure how the fan speed is controlled on the headers for the case fans?  Is it true PWM on pin 4 of the header, or is the speed of the fans controlled by voltage changes across pin 4?

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DunGoneNuts Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Feb 2018 Location: Floriduh USA Status: Offline Points: 71	Post Options Post Reply Quote DunGoneNuts Report Post Thanks(0) Quote Reply Topic: ASRock Taichi AM4 X370 Fan Headers Posted: 19 Feb 2018 at 11:52am
	Does anyone know for sure how the fan speed is controlled on the headers for the case fans? Is it true PWM on pin 4 of the header, or is the speed of the fans controlled by voltage changes across pin 4?
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VUMeter Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 Sep 2017 Location: UK Status: Offline Points: 148	Post Options Post Reply Quote VUMeter Report Post Thanks(0) Quote Reply Posted: 19 Feb 2018 at 9:21pm
	As for CHA_FAN2 (bottom of the board, under the PCIE5 slot), it works as PWM or Voltage mode. I currently have a Noctua NF-A14PWM connected and am controlling it's speed using SpeedFan. I did have a 120mm 3-pin fan from my old Gigabyte case connected and that worked too, with variable speed control. As for the other headers, I am not sure/haven't tested. edit It looks like you are asking a more technical question, I don't know my away around testing the connections enough to answer that. Sorry.
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DunGoneNuts Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Feb 2018 Location: Floriduh USA Status: Offline Points: 71	Post Options Post Reply Quote DunGoneNuts Report Post Thanks(0) Quote Reply Posted: 25 Feb 2018 at 2:23pm
	This is what TS responded to my question: the Fan are controlled via voltage PWM I guess in other words......huh?
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kerberos_20 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 06 Dec 2017 Location: czech republic Status: Offline Points: 3687	Post Options Post Reply Quote kerberos_20 Report Post Thanks(0) Quote Reply Posted: 25 Feb 2018 at 4:23pm
	thats a true pwm yey
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