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how much fan on a pmw header

post #1 of 14
Thread Starter 
Hy everyone

i m on the way to my next build and need nearly 25 fans.

Ist useles i know but ist just a personal challeng that i have

i have one probleme:

i need to get 8 fans on a singel header 12 on a second header an the rest of my fan on the 3rd header

i will make my own cables for each fan (custom lenght) all the fans will be powerd by molex or sata:

but i have one question in mind : how much fan can a header contol in pwm mode does it have any limits if the fans are powerd directly by the psu

i dont want to use any rheobus or fans connector, just want my motherboard uefi to control all the setup

Thanks for reading an all your answer.
post #2 of 14
you need fan connectors, sir.
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post #3 of 14
You should be able to power all the fans with a single PWM signal as long as the power itself is drawn from a direct line with your PSU (molex/SATA)
 
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post #4 of 14
Quote:
Originally Posted by thevirusone View Post

how much fan can a header contol in pwm mode does it have any limits if the fans are powerd directly by the psu
I'm subbed because, as the OP asked, I wanted to know if anyone knew how many fans a PWM signal can be split to from a single PWN header.
I would assume that 3 or 4 would be fine but how about 10? 20?
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post #5 of 14
It depends a lot on the MOBO and the type of fans but, generally, eight fans per PWM header is considered to be the max (assuming only the PWM wires from the fans and the rpm wire from only one fan are connected to the header and the power wires are connected directly to the PSU). Some Corsair fans are notorious for being able to share a PWM header with only two or three fans. For as many fans as you want, it may be necessary to use an external fan controller(s).
     
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post #6 of 14
I'm running 8 fans all split from one motherboard header. Like already mentioned, only PWM signal is split, and power is directly from the PSU. Only one fan per group feeds tacho signal back to the header. Those are Noctua NF-F12 fans and ASUS Z97-WS motherboard. Two headers have 8 fans connected to each, and one header has 7 fans connected to it. All works fine for over a year.
post #7 of 14
I have 7 fans connected to a Swiftech splitter. They all run at specs. The splitter can take up to 10 fans, so I assume 10 would be a safe limit.
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post #8 of 14
Thread Starter 
Thank to everyone
Have receive my asus x99 strix gaming
And my i7 6850k
Start to build the setup.
Fans will come sooner.
I ll give feesback of my setup cable managment
post #9 of 14
Here is the Swiftech PWM Fan Hub It supports 8 fans, and is the only Swiftech one I've seen.
post #10 of 14
Thread Starter 
Thanks for the message but I dont want any hub or cable already build
I Just want to make my own cable
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