SP120 RGB noisy when cold boot?

[pmred01]

Sometime when I boot from cool boot the SP120 RGB got very noisy and rpm drop for 1-2 minutes then run normally.

[solarity]

I am unsure if you are using a CoPro or the motherboard, though it would be easy to see when a system is powered on the fans should run at full, till any logic/software instructs them to do otherwise via voltage control.

[DevBiker]

That's actually pretty normal. It's a DC fan so it gets a full 12V shot to make sure that the fan is running, then settles down to it's "fighting voltage".

 

Also, if it's on a CoPro and the fan curve is based on something other than the CoPro's sensors, the CoPro will run the fan at full speed until the software takes over. If you use one of the CoPro's thermistors for the fan curve, you'll just get the brief blip to make sure it's started.

[Corsair Rick]

Hello pmred01,

 

DevBiker is correct. DC based fans require a start up voltage and then can ramp down. Most fans tend to require at least 10.5-11v to start up and some can then go as low as 5v (SP120 RGB can run at 7v). This is why most, if not all, case fan controllers start at the highest setting when the system boots.

[pmred01]

RPM dropped to 200 rpm with loud noise. Is it normal?

[c-attack]

RPM dropped to 200 rpm with loud noise. Is it normal?

 

Can you be a bit more descriptive? Is it motor noise? Grinding? Clipping? Since 200 rpm is below the minimum run speed, make sure the blade isn't making contact with something.