PWM fan problem

[Grandmaster Fap!]

Lo guys, strange prob, just bought two Bitfenix Spectres to go with an exact other that came with my case i got a while ago.
Problem is, the original fan can be controlled in speedfan ect but as soon as i attach the two new fans to the mainboard, none of them can be controlled and rpms dont register.

All attached to an MSI P67-C45 which in bios can see and control the lone original fan, but same problem, as soon as the others are plugged in, none of them are seen and obviously cant be controlled.

Stumped guys, any ideas?

ps: All three fans are the same part number.

 

[Tealc]

They aren't PWM fans.

How are you connecting them? All to one pin via a splitter? Which splitter? All on separate headers?

 

[Grandmaster Fap!]

All to separate headers on the board. I looked them up on Bitfenix's site and assumed id just bought none pwm fans by mistake but they are the exact same part number as the one that came with my case and that can be controlled, i'm confused Tealc, enlighten me!

 

[Tealc]

The one you linked is clearly a non-PWM 3 pin DC fan. You must have some sort of DC control on the header you initially connected to.

Not quite sure why you lose feedback and control over the original fan. The additional headers on the board may not feature DC or PWM control and just offer straight take it or leave it 12v goodness for your connected fans.

It could be that some kind of strange board logic disables your DC control when the additional fan headers are in use as they don't support it, mind you that would be most odd. I've never heard of such a thing though and it's also strange why you lose RPM feedback.

A strange one.

If you'd like all 3 fans controlled by the single header then you may get away with hooking them all up via a splitter or if you want to go PWM with them look into my PWM converter, as it was originally designed to control Spectres.

http://forums.overclockers.co.uk/showthread.php?t=18421145

 

[Grandmaster Fap!]

Thanks Tealc, the board specs seem to say all the headers are pwm so i guess its a case of send these back and get some proper pwm fans. Shame really as i like the looks of the Bitfenix and they perform well with relative quietness. Any suggestions on a fan that wont break the bank? Bare in mind im a complete sound nazi too

 

[setter]

Its strange though even if all the headers are PWM types, you can still run 3 pin fans on a PWM header, on asus boards though, the cpu fan headers wont speed control 3 pin fans.