Zalman HD160XT Plus Case fan High speeding

[NoBioN]

Hi.

I just installed hardware in this case that i bought.

The case fans are powered by a Adapter cable that allows 4 fans to be connected to 1 normal power cable. The 2 of the fans run nice and quiet. but the one in the bottom of the case is really loud and going really fast. Anyone got a idea as why?

 

[Automata]

What adapter cable, specifically? What make and model of fans are they? Do you have a (good clear) picture of what you are referencing or can link exactly what you have?

Purely based on guessing, since I don't have enough information, is that the fan is of a different type (higher speed) or the cable you are using lowers the voltage on two of the outputs. An easy test is to swap a "quiet" fan with the "loud" one. If the roles reverse, it is the cable. If not, it is the fan.