Connecting fans using a shared 3 pin

[almoststew1990]

I'm running a front fan and rear fan from a single 3 pin motherboard. The problem is the rear fan runs flat out all the time (but the front fan seems fine).

If I the rear fan on the 3 pin on its own it still runs flat out.

So I take it I'll need a new 92mm fan? Or is it some other problem?

 

[almoststew1990]

Both fans are three pin. The connector on the motherboard is a PWM though.

 

[almoststew1990]

What do you mean by tacho signal? As in rpm?

I think the splitter only actual connects two of the three pins of each fan, so it may already not use the tacho signal.

I've sourced a 92mm fan to try out from the clearance section for a quid, can't hurt to try it with a new fan!