Question about Corsair Sp120 RGB

Yes, the controller is absolutely necessary. And unfortunately you can only control them via this. I also find it a shame that you can't even connect them to the Corsair Link. They don't have any connections such as USB or similar. It doesn't work with ASUS either. Of course, you can control the speed of the fans if they are connected to the Corsair Commander, as is the case with me. The colours are connected to the supplied controller via a second cable on the fan and controlled.

Hope this helps 😉