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PWM Fan Splitter?

post #1 of 5
Thread Starter 
I need to run 2 4 pin PWM fans off 1 motherboard header. I see plenty of PWM splitters are available for this purpose, however there are two types:

- ones where both the fan connections have 4 pins
- ones where one of the fan connections is missing the third pin

I think the missing pin is for RPM, and I *assume* one is missing to avoid sending two RPM signals to the motherboard on the same wire and causing it to misread. But thought I would check first.

Which type?

If it matters I have 2 matching Antec F12 PWM Rev 2 fans.
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W10 Desktop
(17 items)
 
Linux Desktop
(14 items)
 
Win 10 HTPC
(12 items)
 
CPUMotherboardGraphicsGraphics
Intel 5820k ASRock x99 Extreme 4 GTX-960 GTX-750ti 
GraphicsRAMHard DriveHard Drive
HD 7850 4 x 4G DDR4 128G Corsair SSD WD 1G  
Hard DriveOptical DriveCoolingOS
WD 2G generic CDRW/DVD CM 212 EVO Win 10 
MonitorKeyboardPowerCase
ASUS 1920x1200 IPS Microsoft Be Quiet 1000 Antec 305 
Mouse
Reaper 
CPUMotherboardGraphicsRAM
AMD FX-6300 ASUS M5A97 R2.0 GTX-760 Samsung 2 x 4G Wonder Ram 
Hard DriveHard DriveOptical DriveCooling
128G Corsair SSD WD 500G Blue generic CDRW/DVD Corsair H60 
OSMonitorKeyboardPower
Linux Mint 17.2 ASUS 1920x1200 IPS Microsoft XFX 650 
CaseMouse
NZXT 210 Reaper 
CPUMotherboardGraphicsRAM
AMD Phenom II B93 Gigabyte  EVGA GT 740 FTW Misc DD2-800 2x2G and 2x1G 
Hard DriveOptical DriveOSMonitor
Seagate  generic  Win 10 Tech Preview 64 bit HDTV 
KeyboardPowerCaseMouse
HP Corsair cx430 Aptevia HTPC IBM 
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post #2 of 5
You got it right. thumb.gif

You want:
Quote:
- ones where one of the fan connections is missing the third pin

Because:
Quote:
I think the missing pin is for RPM, and I *assume* one is missing to avoid sending two RPM signals to the motherboard on the same wire and causing it to misread.
Quote:
But thought I would check first.
That's the smart thing to do! thumb.gif
post #3 of 5
As a second opinion: Yes, you want the one without the 3rd pin.

The other type could have dummy pins that aren't actually hooked up though. Just to keep the connection in place.

In case you were wondering what would happen if you connected multiple RPM leads to a motherboard: The speeds get added up wink.gif
Source: my DIY PWM splitter I once made thumb.gif . There was a 12000 RPM fan in my rig according to HWmonitor biggrin.gif (3 x GT AP-30's)
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post #4 of 5
Thread Starter 
OK thanks!
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Win 10 HTPC
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CPUMotherboardGraphicsGraphics
Intel 5820k ASRock x99 Extreme 4 GTX-960 GTX-750ti 
GraphicsRAMHard DriveHard Drive
HD 7850 4 x 4G DDR4 128G Corsair SSD WD 1G  
Hard DriveOptical DriveCoolingOS
WD 2G generic CDRW/DVD CM 212 EVO Win 10 
MonitorKeyboardPowerCase
ASUS 1920x1200 IPS Microsoft Be Quiet 1000 Antec 305 
Mouse
Reaper 
CPUMotherboardGraphicsRAM
AMD FX-6300 ASUS M5A97 R2.0 GTX-760 Samsung 2 x 4G Wonder Ram 
Hard DriveHard DriveOptical DriveCooling
128G Corsair SSD WD 500G Blue generic CDRW/DVD Corsair H60 
OSMonitorKeyboardPower
Linux Mint 17.2 ASUS 1920x1200 IPS Microsoft XFX 650 
CaseMouse
NZXT 210 Reaper 
CPUMotherboardGraphicsRAM
AMD Phenom II B93 Gigabyte  EVGA GT 740 FTW Misc DD2-800 2x2G and 2x1G 
Hard DriveOptical DriveOSMonitor
Seagate  generic  Win 10 Tech Preview 64 bit HDTV 
KeyboardPowerCaseMouse
HP Corsair cx430 Aptevia HTPC IBM 
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W10 Desktop
(17 items)
 
Linux Desktop
(14 items)
 
Win 10 HTPC
(12 items)
 
CPUMotherboardGraphicsGraphics
Intel 5820k ASRock x99 Extreme 4 GTX-960 GTX-750ti 
GraphicsRAMHard DriveHard Drive
HD 7850 4 x 4G DDR4 128G Corsair SSD WD 1G  
Hard DriveOptical DriveCoolingOS
WD 2G generic CDRW/DVD CM 212 EVO Win 10 
MonitorKeyboardPowerCase
ASUS 1920x1200 IPS Microsoft Be Quiet 1000 Antec 305 
Mouse
Reaper 
CPUMotherboardGraphicsRAM
AMD FX-6300 ASUS M5A97 R2.0 GTX-760 Samsung 2 x 4G Wonder Ram 
Hard DriveHard DriveOptical DriveCooling
128G Corsair SSD WD 500G Blue generic CDRW/DVD Corsair H60 
OSMonitorKeyboardPower
Linux Mint 17.2 ASUS 1920x1200 IPS Microsoft XFX 650 
CaseMouse
NZXT 210 Reaper 
CPUMotherboardGraphicsRAM
AMD Phenom II B93 Gigabyte  EVGA GT 740 FTW Misc DD2-800 2x2G and 2x1G 
Hard DriveOptical DriveOSMonitor
Seagate  generic  Win 10 Tech Preview 64 bit HDTV 
KeyboardPowerCaseMouse
HP Corsair cx430 Aptevia HTPC IBM 
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post #5 of 5
No problem. Thanks for the rep. thumb.gif
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