X470 Taichi ultimate fan start weird sound

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   Hello

I bought weeek ago motherboard x470 taichi ultimate.
I changed b450 tomahawk to taichi. It was simple and works great from first turn on.
My set:
Ryzen 2700
x470 taichi ultimate  bios P3.30
2x8 GB 3200 MHz cl15 ram g skill
goodram iridium pro 240 GB
MX 500 500 GB
GTX 1070 palit superjetsream 
RMX 750 W 2018 edition
Fractal r6 blackout + 2 bequiet purewings 140 mm pwm

Unfortunately there is one small problem. In bios I set that two fans from bequiet to start from 45 celsius degree (dc mode because I cant set start in pwm mode from 45 deegres ). Sometimes when fan connected to CHA_FAN1/WP starts I hear weird sound like scratch or coil noise. Its hard to determine this sound. 

I tried to change fans connected to CHA_FAN1/WP but always result is the same on this one fan connector. 
Be quiet fans have six months, case with fans I bought year ago so all fans aren t faulty I guess.

On b450 tomahawk bequiet fans was set to start from 450 degrees and there wasn t any sound like on taichi.

Does I set something wrong in bios or motherboard is faulty? Maybe You know reason of this weird sound?

Regards
Marcin

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marcin2468 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 17 Sep 2019 Status: Offline Points: 54	Post Options Post Reply Quote marcin2468 Report Post Thanks(0) Quote Reply Topic: X470 Taichi ultimate fan start weird sound Posted: 18 Sep 2019 at 12:24am
	Hello I bought weeek ago motherboard x470 taichi ultimate. I changed b450 tomahawk to taichi. It was simple and works great from first turn on. My set: Ryzen 2700 x470 taichi ultimate bios P3.30 2x8 GB 3200 MHz cl15 ram g skill goodram iridium pro 240 GB MX 500 500 GB GTX 1070 palit superjetsream RMX 750 W 2018 edition Fractal r6 blackout + 2 bequiet purewings 140 mm pwm Unfortunately there is one small problem. In bios I set that two fans from bequiet to start from 45 celsius degree (dc mode because I cant set start in pwm mode from 45 deegres ). Sometimes when fan connected to CHA_FAN1/WP starts I hear weird sound like scratch or coil noise. Its hard to determine this sound. I tried to change fans connected to CHA_FAN1/WP but always result is the same on this one fan connector. Be quiet fans have six months, case with fans I bought year ago so all fans aren t faulty I guess. On b450 tomahawk bequiet fans was set to start from 450 degrees and there wasn t any sound like on taichi. Does I set something wrong in bios or motherboard is faulty? Maybe You know reason of this weird sound? Regards Marcin