Pretty newbie question
When builds like in pcirel have synchronized rgb fans, is that a case feature, a mobo feature, or neither?
Are all those fans connected to an extra controller that comes with the case? or does the mobo control that? or do you have to buy an adapter to control them and install that on your mobo before?

While i dont care much for how the pc looks it seems that fans with rgb are as expensive (sometimes even cheaper the fuck) than plain fans so might as well have coordinated if its about the same price.
Ty