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Old December 10, 2010, 02:39 PM
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Default How many fans per motherboard header?

I am currently using a Rampage 3 Extreme. I have a few Gelid Silent 12 fans that draw .18A @ 12 V. I plan on making a 3 way fan splitter so I can connect the three top fans of my case to the same header. Out of my R3E manual:

The fan connectors support cooling fans of 350mA-2000mA (24 W max.) or a total of 1A-7A (84W max.) at +12V.

If someone could walk me through the math used to calculate my answer, that would be much appreciated.
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Old December 10, 2010, 02:45 PM
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Gelid's are fairly low power fans, you definitely shouldn't have any problems.

Doing the math, you can realistically put 10+ fans on a daisy chain to that header assuming the motherboard specs are correct.

0.18Ax12V=2.16W
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Old December 10, 2010, 10:15 PM
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while it can take quite a bit of amperage, i would stick to one low to medium power fan. get a controller, if you have that many :)
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Old December 30, 2010, 11:52 PM
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I would susggest using this.

Sunbeam RHK-EX-BA Rheobus-Extreme


I use a few of these on different computers and you can run many fan's from it.
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Old December 31, 2010, 12:32 AM
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I'd like to see how this goes aswell, as I've been wondering if I can do the same in the future. Since I'm using the same fans!
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Old September 1, 2012, 05:15 PM
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Just chain them all right up to the psu? Do fans still come with 4pin these days? my case fans are like 3-4years old.
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Old September 3, 2012, 09:46 AM
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I think op might be dead from the fire.
[ or a total of 1A-7A (84W max.) at +12V.]
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Old September 3, 2012, 12:13 PM
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I ran a 3300RPM delta server fan off of an R2gene for over a year so no worries on 3 geild's.
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Old September 3, 2012, 02:48 PM
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Canada Computers | Cooling | GELID PWM 1-to-4 Splitter (CA-PWM-03) -- connect up to 4 PWM fans to CPU socket

try this pwm on mb header 4 fans powered by molex
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Old September 3, 2012, 03:16 PM
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Quote:
Originally Posted by krajee View Post
I am currently using a Rampage 3 Extreme. I have a few Gelid Silent 12 fans that draw .18A @ 12 V. I plan on making a 3 way fan splitter so I can connect the three top fans of my case to the same header. Out of my R3E manual:

The fan connectors support cooling fans of 350mA-2000mA (24 W max.) or a total of 1A-7A (84W max.) at +12V.

If someone could walk me through the math used to calculate my answer, that would be much appreciated.
The math doesnt add up. Its either 2A max@12v (24w), or its 7A max@12v (84w), unless you're misreading the book, and the 1-7A part is referring to the combined fan headers output power. Which I think is the more likely case.

Assuming the latter, and its a single/combined spec, if your fans are drawing 180mA, you could hook up 11 based on the first numbers given, but that many fans in parallel are gonna drop the voltage a bit, creating a strain, plus start up spin draw is always higher then running speed draw.

I personally wouldnt go higher then 3-5, and see what your bios says your fan speeds (and voltage if it has it) are at, and make a call from there. Or, just skip that and get an aftermarket header.
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