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Does it work that way?

post #1 of 21
Thread Starter 
I have been wondering something for a very long time.

Fan splitters.
http://www.aquatuning.at/product_inf...--UV-Gr-n.html

Let´s say you have one of those splitters ...it connects 6 fans to a single 3Pin Molex.

So let´s say we have 6x Gentle Typhoon with max 1850 RPM and 2.5Watt Power requirement.

If I connected all six fans to that adapter which woud connect all 6 fans to a single fan header on my Motherboard ...would all 6 Fans be supplied with the exact same amount of power????
Meaning would they ALL spin at their maximum rotation of 1850 rpm?
And would they all be fed their maximum power of 2.5 Watt evenly?
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post #2 of 21
If they would work then yes, they would all work @ rated RPM with the rated power consumption; the only thing is I don't think they would work because: a)The fans when they start take more than double the rated power; b) one 3pin motherboard connector can't possibly supply that amount of power.
Since the fans are conected in parallel they'll be suplied with the normal voltage - then the fan will demand a certain current that corresponds to its rated power consumption. 6 fans starting up can ask for a lot of current and then it depends what happens - either the mobo has integrated overcurrent protection so the fans won't start at all, or the 3pin power regulation would burn out if there's no OCP.
My advice would be to get this type of splitter, only to hardwire it to a HDD PATA Molex connector (4 pin) as they can supply the amount of power needed for 6 fans or more.
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post #3 of 21
i seriously wouldnt think so figure it this way say u have 4 molex connectors on one line each molex supplies 12v if each fan runs at 12v only 4 fans can be connected without drawing to much power and possibly compromising that specific power line. i could be completely wrong on this but thats my idea of how it works.

note: voltages are not exact its an example
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post #4 of 21
Thread Starter 
So what will I do?

I have a Little Devil V8 ....3x140mm and 4x120mm need to be powered.
Since they are all rated for 800RPM they don´t need to be regulated since they are completely silent at 12 Volt their maximum power requirement.

I thought I would just use a 7 Splitter Molex cable and connect them all to one fan header on my power supply.
But if you say that won´t work I have another idea.

Here a fan controller that only functions as ON/OFF controll

http://www.aquatuning.at/product_inf...er-5-Port.html

It is rated to supply every of the 5 channels with 60Watt.

Since I have 7 fans that need to be powered I thought I could use a 3Pin to 2x 3Pin Splitter Connector in order to put 2 fans on 1 channel of the fan controller...the 60 Watt per channel should be able to handle two fans right?


Do you think that could work?

Or is there a better (cheaper) idea?
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post #5 of 21
my advice is to use this fan controller. I disslike the idea of a fan controller that just turn's the fans off. also, you can use the PWM function from your mobo and controll all fans with that little guy. He has a 30w max load so he can handle the strain of all your fans on one channel if you like. There is also a 3 knob version, you could use 1 3 pin splitter and run 2 fans per channel. best of luck
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post #6 of 21
Thread Starter 
To give you a little more information

Here the Fans I will be using:

Bitfenix Spectre White:
I will use 4x120mm and 3x140mm of those fans
Hope you can give me some feedback on those as well since I am not sure to get them.


Also here my case:


And here the fan controllers I have access to:http://www.aquatuning.at/index.php/l...n/cPath/47_463


And just to make sure ...it is possible to connect two fans with a splitter to one channel of a fan controller with for example 30 or 60 Watt?
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post #7 of 21
I have to admit I really like the controller posted by KhaoticKomputing. It's not very cheap though, but it looks nice.

Since you said you'd like a cheaper solution and you don't need speed variation I propose this a mod. I'll explain it in many words so that it'd be clear, but it actually a 5mn job.
*get the 5€ fan splitter
*in stead to connect it to the motherboard's 3 pin grab a knife and some duct-tape and do this mod:
***get the fan splitter and look closely to the 3pin connector that is supposed to be plugged in the motherboard, it should look like this:

Pin Name Color 1 GND black 2 +12VDC or +5VDC red 3 Tachometric Signal yellow

***you only need the GND and the +12VDC wires from the splitter; the tacho wire isn't useful anyway since you'll have 6 fans connected
***also grab from the PSU a 4pin HDD molex connector that is free, like the one pictured below that can take 60W on the +12V:

Pin Name Color Description 1 +12V Yellow +12 VDC (up to 60 watts max) 2 GND Black +12 V Ground (Same as +5 V Ground) 3 GND Black +5 V Ground 4 +5V Red +5 VDC (up to 25 watts max)

***grab that knife, cut off the 3pin mobo connector from the splitter and the 4pin Molex from the PSU and connect one wire from the 3pin and one from the 4pin like that: +12V to +12V and GND to GND. Isolate well all the other wires.

The end. Now when you boot up the 6-way splitter will be powered by the +12V wire that comes directly from the PSU and can handle 60W (probably more).

If you have any questions...
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post #8 of 21
Whats is important is to take your total amp's/watts needed to start all of your fans. What ever fan controller should be rated for at least that per channel. I recomended the Rheosmart due to 30w per channel, one channle will hold all your fan's. Due to price issue's I take back that recomendtation, and replace it with this little guy, He's only rated at 20w, there there are a few thread's in here about people pushing close to 30w per channel and it taking it like a hoss..somthing about the internals are rated higher than the controller was rated by sunbeam or somthing. Regaurdless of fan's used, get a controller that will handle them all. No clue what the one you linked is rated at or anything. Best of luck

EDIT: i saw the stats on the fan after this post lol. the one you clicked(lamptron hummer 5 switch) has enough wattage per channel to hold your fans. get the one that is cheaper/looks the best for your application.
Edited by KhaoticKomputing - 5/6/11 at 7:52am
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post #9 of 21
Thread Starter 
1.)Please take a look at the fan I posted above ...it is the one I intend to use for my entire case.I didn´t find anything about so I hope you can tell me a little something about it^^

2.)Since the fan is 800-1000 RPM ....I can keep it running at 12 Volts with no problem.
I have the budget to get the little more expensive fan controller but there is no reason in buying because I don´t require the function to regulate the fan speed anyways
That is why I chose the On/Off Fan "Controller" not to function as a "Controller" but to be used as fan medium...I could also have bought 7 Molex to power connectors instead^^ but that would come cheaper and look better with the plus that I can put 2 fans on one channel since every channel has 60 Watts
Heck I could all 7 fans on one channel^^
I think On/Off fan controllers are a good idea...we are living in a time in which the industry is concentrating more and more about sound , silent, be quiet etc etc...regulating a fan was always about noise...what other reason is their to control your fan speed? if you can have good cooling ability with 12 Volts and it is still unhearable?
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post #10 of 21
i ran 6 2100rpm fans off one psu molex connector

but i would not run more then one off the mb
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