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Powering 18 PWM fans?

post #1 of 9
Thread Starter 
Greetings out there,

I am currently working on a huge project and ran into a small bump in the road.

I currently have a minimum of 18 fans that I need to power and if possible, run in PWM. There may be the need for 20 fans if I go totally overboard,
and to make things worse, the "fancontroller", if such a thing even exist, HAVE TO BE external - As the whole project is done without a case.


The fans have the following spec:





Before so, I would simply run these of an external 90W 12V PSU and then switch between 5V, 7V or 12V - But if PWM is somehow possible that would be even better.

Any ideas?

And before anyone asks, will be using a Lian Li T1 Spider (Found one that been collecting dust in a warehouse, box still wrapped in plastic!) along with 2 x MORA that will also serve as a pedestal for the "Spider". Pump is the Swiftech 35X2, so no worries about the flow etc.

And yes, I will try and run it all passive at first, see what happens smile.gif




Edited by Gomi - 5/20/15 at 7:43am
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Frozen Kaveri
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post #2 of 9
Looks like your running Cooler Master Jetflo's. Really good fans for the money. Loud at full RPM and work wonders on low and medium FPI radiators. I have 4 Jetflo red led lol. Your best bet would be to buy a Powered PWM Splitter from Swiftech. Most likely need 3 to cover all 20 fans if needed. Since the fans will be powered by a SATA power connector, it will have enough juice to power all fans that connected to that particular splitter.
post #3 of 9
Thread Starter 
Yah, just ordered 3 of them, can mount them so the cannot be seen :-) Thanks!
Frozen Kaveri
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Frozen Kaveri
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post #4 of 9
The problem you are going to have is the PWM signal from motherboard will not be up to the task of supplying that many fans. 8-12 fans is typically the limit. I've seen some write-ups for linier PWM signal boosters .. and they might be an option. But I have no experience in their use so can't recommend any of them.
post #5 of 9
How about an Aqua Computer Aquaero 5LT or 6?

It can be totally external, with our without an LCD display, is USB controlled.



The 6 serious has 4 PWM channels, each capable of controlling up to 30 watts of fans/pumps.


I have the 6 and HIGHLY recommend it.
Edited by 47 Knucklehead - 5/20/15 at 10:11am
post #6 of 9
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post #7 of 9

The problem with just a simple splitter and 18+ fans (which I user to do on 3 360 radiators) is that the wattage of all those fans will be too much for a typical motherboard PWM header. Depending on the motherboard, you are looking at maybe 10-15 watts per header.

For example, in my The Betty build, 18 Gentle Typhoon fans would draw a total of 58.584 watts.
Edited by 47 Knucklehead - 5/20/15 at 10:16am
post #8 of 9
Quote:
Originally Posted by 47 Knucklehead View Post

The problem with just a simple splitter and 18+ fans (which I user to do on 3 360 radiators) is that the wattage of all those fans will be too much for a typical motherboard PWM header.

For example, in my The Betty build, 18 Gentle Typhoon fans would draw a total of 58.584 watts.

That splitter provides power to the fans from SATA power, my understanding is that is only pulls the RPM signal from the MOBO header.

Edit: I use multiple of this specific splitter to power 14 GT's and 2 SP120's and have had 0 issues. I'm not using them for the PWM aspect, just for power distribution, infact they aren't even connected to the mobo in my application.
Edited by Rhuarc86 - 5/20/15 at 10:18am
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post #9 of 9
Quote:
Originally Posted by Rhuarc86 View Post

That splitter provides power to the fans from SATA power, my understanding is that is only pulls the RPM signal from the MOBO header.

Ah, my bad, yeah, a splitter like that or the NZXT Grid+ would work if you ganged 3 of them together.

When you said a simple splitter, I didn't actually click on the link to see it was powered.
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