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ab350 pro4 chasis fan1 speed control not working

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boltless View Drop Down
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    Posted: 16 Apr 2017 at 12:25pm
ab350 pro4, the 3-pin (DC mode) fan speed of chasis fan 1 jumper is not adjusted.
chasis fans jumper 2 and jumper 3 have good speed control with 3-pin fan.


Edited by boltless - 16 Apr 2017 at 12:31pm
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y3llo View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote y3llo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Apr 2017 at 11:23pm
Can confirm. I found in a FAQ somewhere that chassis 1 does not work with 3 pin. Other fan connectors work fine with 3 pin.
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boltless View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boltless Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2017 at 12:46am
Confirmed.
I should have seen faq in advance.
Thank you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nerio_Lab Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2017 at 1:57am
In UEFI choose DC or PWM mode.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boltless Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2017 at 10:04am
there is no option for choose dc or pwm in bios.
according to faq.. just auto detect fan type in chasis fan 2, 3.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ruspartisan Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 2017 at 12:21am
If you plan to adjust fan speeds according to CPU temperatures and your cooler's fan is PWM-controlled, you can connect cooler's fan to the problematic header (Chassis fan 1), and connect the case fan to CPU header, and change control method from PWM to DC. It's a dirty hack, but may work.
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