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# of Fan's sockets Complementary to # pins on Mobo

post #1 of 7
Thread Starter 
If a fan has four holes for the pins. Can it fit and work properly on 3-pin on the mobo?

I have a 120mm fan. It has a socket where it has 4 holes. Only available fan pins on my mobo are 3 pins. Only the cpu fan has 4. If I plug this fan onto the 3 fan pin on my mobo, will this fan work?
Edited by legendor - 6/7/08 at 9:31pm
    
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post #2 of 7
What fan?
Pickey of the connector?
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post #3 of 7
Quote:
Originally Posted by billbartuska View Post
What fan?
Pickey of the connector?
I believe he already has the fan...

To answer your question, i think it will work. The 4th wire is an rpm sensor or something like that i think, someone correct me if im wrong.
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post #4 of 7
Yes, you can plug in a 4 hole fan connector into your motherboard's 3 pin. The only downside to this is that your fan will be running at max speed and you will not be able to control it.

I have two 4 holes fan I am plugging into a 3 pin with two different methods, but very similar.

1. Into the 3 pin motherboard like yours.

2. I took a splitter, whatever the wire is called. I clipped the side because it only allowed a 3 hole fan, but not 4. It works!

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post #5 of 7
The blue wire is for the automatic speed variation / PWM
A 3 pin fan varies speed via voltage
So without the 4th pin, the fan is basically a 3 pin fan - speed varied via voltage, not the PWM circuit.
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post #6 of 7
I was looking for the pinouts on the fan so I could be sure that it would function as a 3 pin fan (speed control via voltage). But, as stated, it should be ok.
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My System
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CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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Logiteck G400s none 
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post #7 of 7
it will work, as long as you maintain the connector to connector keying
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Chuckle2Tits
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1x300 GB WD Velociraptor Asus 16/48 DVD/CD ROM SATA Windows 7 Pro 64 bit Viewsonic VX2255wmb 22" LCD 
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Logitech USB wired Silverstone Decathalon 850 PolymorphiX (PMX_v1s) ms optical, wired 
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