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Which fan headers for a push pull?

post #1 of 11
Thread Starter 
I know for most single fan coolers, the fan plugs into the CPU fan header, but what do you use when you setup a push pull? 1 goes in the CPU fan header, and the other into a chassis fan header? Seems to me that you would want both to run equally but if they are plugged into two different ports, they won't. Or am I overthinking this and it really doesn't matter that much?
post #2 of 11
You can normally set the fan speed of the headers in the bios.

I wouldn't stress it too much. But you can always get a fan controller, which is nice to have anyways for full control.
post #3 of 11
PWM fan spliter (4 pin )
look it up at your fav supplier
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post #4 of 11
I use splitter cables that came with my NH-D14 and Loki coolers to connect both fans to the CPU header.

You can get them here for $2.99 with free shipping.

http://www.amamax.com/poincadccofa.html
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post #5 of 11
You can use a PWM splitter. Most CPU fan headers can power at least two fans (unless you plan on running high speed Delta's or something)
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post #6 of 11
Thread Starter 
Wow that's pretty awesome. I didn't know you could use those. I had always read about people discouraging running multiple fans off 1 header. Do those work for chassis fans too?
post #7 of 11
Yes, as long as you don't exceed the power rating of the fan header (typically 1 amp @ 12w)
post #8 of 11
There are various PWM splitters available, such as the Akasa AK-CB002 Smart Fan Cable, which allow you to run more than one fan off a motherboard PWM header while drawing the power directly from the PSU instead of the motherboard. The motherboard header takes the tachometer RPM reading from only one of the fans in the chain and supplies a PWM signal which is transmitted to each of the fans to govern its power supply while the 12 volt and ground wires come to each fan through a molex connector from the PSU. There's a very good explanation of it here.

426

What I can't understand, however, is why so much wire has to be used - especially cluttering up a CPU header beneath an aftermarket cooler - by connecting all the terminals in parallel. Without wishing to convene a mad electricians convention over the matter, is there some reason why the terminals can't be connected in series, like Christmas Tree Lights?

535
post #9 of 11
can there be a four pin, 5 wire spitter? to connect five fans to? only see three on those.
post #10 of 11
From what I've been able to see this is a mod that overclockers have been developing for themselves over the last couple of years with the market trailing along behind. There have been various figures given for the number of PWM fans people have daisy chained together like this. The limiting factors are the 12v line from the PSU and either the number of wires that can be spliced into a Molex Kk housing or the strength of the PWM signal, so in reality it's probably more to do with how many fans you can fit in your case. Six seems to be quite a common number given.
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