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CHA_fan1 and 2 fluctuation

clwebb
By clwebb
in Troubleshooting
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I switched out my motherboard and it now giving me issues with fan reading. In BOIS my CHA_fan 1 and 2 are fluctuating from like 500rpm up to 10000 and sometime CHA_1 does not even show up, I did a BOIS flash to the lastest version and it is still the same! I am just wondering if I have something on that is making it do this, the fans is have connected are Corsair SP120s and the motherboard is ASUS M5A99FX PRO 2.0.

 

Is it a bad board? Not enough power, I have RM650w

 

Also on speedfan it shows PWM mode as software controlled and temp sensor diode as thermistor is that is any idea of why this is happening, I hope its not the board as I cannot return it! 

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I've had fans that have done the same thing to me too, I think it's down to the sensor on the fans, or perhaps it happens with certain Mobo+Fan combinations, at any rate, it isn't really anything to worry about too much.

System specs
  • Graphics card: Asus GTX 980 Ti (Temp target: 60c, fan speed: slow as hell)
  • CPU: Intel 6700k @ 4.2Ghz
  • CPU Heatsink: ThermalRight Silver Arrow Extreme
  • Motherboard: Asus Maximus Viii Gene
  • Ram: 8GB of DDR4 @ 3000Mhz
  • Headphone source: O2 + Odac 
  • Mic input: Creative X-Fi Titanium HD
  • Case: Fractal Design Arc midi R2
  • Boot Drive: Samsung 840 Pro 128GB 
  • Storage: Seagate SSHD 2TB
  • PSU: Be quiet! Dark Power Pro 550w

Peripherals

  • Monitor: Asus ROG Swift PG278Q
  • Mouse: Razer DeathAdder Chroma (16.5 inch/360)
  • Mouse surface: Mionix Sargas 900
  • Tablet: Wacom Intuos Pen
  • Keyboard: Filco Majestouch Ninja, MX Brown, Ten Keyless 
  • Headphones: AKG K7xx
  • IEMs: BrainWavs S1
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I have the same motherboard, and used to have the same fans, it's a known problem that SP120s have wierd RPM monitoring. When I had my SP120s, it would say the fans were at 0 RPM when in reality they were running perfectly fine. It's nothing to worry about.

Intel Core i7-5820K (4.4 GHz) | Gigabyte GTX 970 G1 Gaming | Corsair Vengeance LPX 16GB  | 2x 360mm Custom Loop (Noctua iPPC) | ASRock X99 Extreme6 | Samsung 840 EVO 250GB | Fractal Design Define S | Corsair HX750 | Windows 10 | Corsair M65 RGB PRO | Corsair K70 RGB LUX (CherryMX Brown) | Beyerdynamic Custom One Pro & Creative Sound Blaster Z | Nexus 6P (32GB Aluminium) | Check out my setup: Project Kalte Here!

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  • Author

So these fans are crap? Or the sensors on the MB are broken?

 

I am still not able to control these and they are PWM

 

Should I get a fan controller for them?

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