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How to run 4 x PWM fans off the CPU header?

post #1 of 6
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My motherboard is a Rampage III Extreme and I think it can take 4 fans on one header. But if it didn't, I'd be looking to power 4 PWM fans some other way but still have the PWM signal run to the CPU header on my motherboard. Anyone know how I can do this?
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post #2 of 6
Molex to PWM splitter

Even cheaper

You'll need to add a normal PWM splitter to one of the non-tach legs of the 3-way to gain the fourth fan connector.
Edited by Steamboat Steve - 5/20/11 at 12:29pm
post #3 of 6
Your Asus MB support fans of 350 mA-2000 mA (24W max) at 12v. Just use the onboard PWM fan headers CPU_FAN, OPT-FAN1/2/3 for the 4 Fans. If you need to double up the fans, use a PWM splitter and turn on thermal management in BIOS.
post #4 of 6
Quote:
Originally Posted by gymenii;13576368 
Your Asus MB support fans of 350 mA-2000 mA (24W max) at 12v. Just use the onboard PWM fan headers CPU_FAN, OPT-FAN1/2/3 for the 4 Fans. If you need to double up the fans, use a PWM splitter and turn on thermal management in BIOS.

The load is totally dependent on the fans being used. So, to be safe, I'd take the load of the fans combined and double it for start up surge. If it's less than 24W, then it'll work.
To be even safer, I'd actually measure the starting draw of the fans.
post #5 of 6
Make a quadruple "Y" cable. Unless the total amperage is to high...
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Ethylene Glycol
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post #6 of 6
Akasa 3-fan PWM splitter (power from Molex, control from mb) will get you part way there (available here). A high-quality PWM Y-adapter will finish the job (and free shipping).

Or you can make your own by cutting apart two of those Y-adapters and hooking them up with a Molex.
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