Such a splitter connects two or more fans to a single fan header on the motherboard.
Connect multiple fans to motherboard.
You can also get pwm fan controllers powered through molex sata power or the like where you can connect several fans and control them via software.
Most motherboards come with two rgb headers each supplying 12v of power.
First if you know the power ratings of your fans and of your motherboard you may be able to use a splitter such as the rosewill case fan pwm cable splitter.
The cabled labled to rgb hub will plug into the small 6 port corsair rgb fan led hub that comes with the multi pack of fans.
This wire can either be plugged into a normal fan header on your motherboard or preferably into a corsair commander pro.
The last pin just won t be used.
In fact there are a number of ways to do so.
However if you have a particularly large pc case that you plan on filling with multiple rgb fans each requiring its own.