When and where to use a fan splitter - Overclock.net

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post #1 of 6 Old 10-17-2013, 03:01 PM - Thread Starter
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My mini ITX motherboard only has two fan header connectors, and they're currently being used by the rear case PWM fan and CPU fan. I'm planning to buy some splitters so I can control both fans with one connector and free up the other one for a third fan.

If the fans would be controlled by software, the output to both fans will be the same, right? I'm fine if they get the same amount of throttle, since they'd be sitting very close to each other anyway.

By the same token it would probably not be wise to hook up an LED light bar to a header that is shared by a fan. Is that the point where splitters won't suffice and I should use a fan controller?
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post #2 of 6 Old 10-17-2013, 10:55 PM
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Let me get this straight. You want to end up with three fans + a light bar? If you have a spare molex connector, there are molex to fan adapters. I'd go that route for the light bar, and save the fan headers for fans. just my 2cents.gif
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post #3 of 6 Old 10-18-2013, 02:40 AM
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You can use a PWM splitter with PSU power GeLID and Swiftech are the best. I do not like the braided Akasa because the braid & heatshrink make a stiff section before wire goes into socket causing wire to stress fatigue and break.
Gelid 4x PWM splitter with molex, Swiftech 8-way PWM splitter hub with Sata, & Akasa 3x PWM splitter with molex


Using a splitter like above with PSU power you can run many fans all controlled by CPU fan header.. slow and quiet when surfing watch videos and speed up to supply needed air to cooler when gaming. I've ran 10 fans with no problem but 11 started having problems with PWM signal strength.

post-flame-small.gifPhanteks Owners Club post-flame-small.gifpost-flame-small.gifWays to Better Cooling post-flame-small.gif
post-flame-small.gif1. Controling PWM Case Fans post-flame-small.gif2. Optimizing Case Cooling post-flame-small.gif3. Cooler Size Comparison & Cooling Comparison
post-flame-small.gif
=i7 980 @ 3.55GHz =PH-TC14PE w/2x TY-143 fans =Crucial Ballistix 3x4GB =GA-X58A-UD5 =ASUS GTX580 DirectCU II =Enermax Modu84+ =Define R2 w/3x TY-140 case intake fans; all PWM controlled by CPU fan socket
Phanteks Enthoo Primo MoBo Rampage III Extreme CPU i7 980xCooler R1 Ultimate w/ TY-147A fans RAM Dominator GT 6x2GB GPU ENGTX580 DCUII PSU Corsair TX850 Case [/COLOR]Phanteks Enthoo PrimoBase custom caster base
=i7 980X @ 4.0GHz =R1 Ultimate w/2x TY-143 fans =Dominator GT 6x2GB =Rampage III Extreme =ASUS GTX580 DirectCU II =TX850 =Enthoo Primo w/ custom castor base
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post #4 of 6 Old 10-18-2013, 10:56 AM - Thread Starter
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Thanks for the help. The molex-to-fan adapter seems like the simplest solution to go, then I can leave the LED bar in its own connection and make it possible to add a switch later so I can turn it on or off if I choose.

The Swiftech splitter hub also looks nice, and I think I prefer this for the fans because it looks tidier. I can easily stick this to a wall. It's an interesting choice why they chose SATA for power instead of 4-pin molex. Like this article says, I'd like to find out why.
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post #5 of 6 Old 10-18-2013, 01:22 PM
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Keep in mind that PWM splitters only comtrol PWM fans. 3pin fans will run at 100% speed on the 12v power from Molex / Sata.

post-flame-small.gifPhanteks Owners Club post-flame-small.gifpost-flame-small.gifWays to Better Cooling post-flame-small.gif
post-flame-small.gif1. Controling PWM Case Fans post-flame-small.gif2. Optimizing Case Cooling post-flame-small.gif3. Cooler Size Comparison & Cooling Comparison
post-flame-small.gif
=i7 980 @ 3.55GHz =PH-TC14PE w/2x TY-143 fans =Crucial Ballistix 3x4GB =GA-X58A-UD5 =ASUS GTX580 DirectCU II =Enermax Modu84+ =Define R2 w/3x TY-140 case intake fans; all PWM controlled by CPU fan socket
Phanteks Enthoo Primo MoBo Rampage III Extreme CPU i7 980xCooler R1 Ultimate w/ TY-147A fans RAM Dominator GT 6x2GB GPU ENGTX580 DCUII PSU Corsair TX850 Case [/COLOR]Phanteks Enthoo PrimoBase custom caster base
=i7 980X @ 4.0GHz =R1 Ultimate w/2x TY-143 fans =Dominator GT 6x2GB =Rampage III Extreme =ASUS GTX580 DirectCU II =TX850 =Enthoo Primo w/ custom castor base
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post #6 of 6 Old 10-18-2013, 11:05 PM - Thread Starter
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Quote:
Originally Posted by doyll View Post

Keep in mind that PWM splitters only comtrol PWM fans. 3pin fans will run at 100% speed on the 12v power from Molex / Sata.

Yep, my CPU fan is PWM and so is the rear case fan. So all is good now smile.gif
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