Can I plug a 4 pin fan into a 3 pin header? (PWM)

Discuss cases, PSUs, and various cooling techniques in here.

Can I plug a 4 pin fan into a 3 pin header? (PWM)

Postby FormatC » Fri Sep 14, 2007 4:35 pm

I found a great deal for 80 MM PWM Fans which my older case uses and my fans are all old and about to die (Plus there full of cat hair) so can I plug these fans into a regular 3-pin MB header or a Molex with the proper adapter? Since these fans put out 59/46 CFM/DBA I want to build a fan bus what would I need to use the PWM circuit already in the fan in my fan bus? Thanks
Computers are a lot like air conditioners - they both work great until you open up windows.
FormatC
Legit User
Legit User
 
Posts: 22
Joined: Tue Oct 04, 2005 3:20 am

Re: Can I plug a 4 pin fan into a 3 pin header? (PWM)

Postby kenc51 » Fri Sep 14, 2007 4:50 pm

Yeah it will work ok, no problem! The pin layout is: Pin 1 = +12V | Pin 2 = GND | Pin 3 = Speed sensor | Pin 4 = PWM pulse
The fans are designed to work with a 3pin header as well.
User avatar
kenc51
Legit Extremist
Legit Extremist
 
Posts: 5164
Joined: Thu Jun 23, 2005 1:56 pm
Location: Dublin, Republic of Ireland

Re: Can I plug a 4 pin fan into a 3 pin header? (PWM)

Postby stev » Fri Sep 14, 2007 6:49 pm

Some PWM fans will not work without PWM feedback in the loop. You'll just have to try it to see if your fan will work that way or not. If it doesn't then don't toss it out, it will still work with the 4-pin PWM control.
AMD X2 TK-57 1.90Ghz | F700 Quanta | PC2-5300 DDR2 2Gb | GeForce 7000M | DVDRAM GSA-T40N | HP LaserJet 1018
My Stats http://folding.extremeoverclocking.com/extra_page.php?s=&u=303718
Image
http://www.eff.org - Electronic Frontier Foundation - working to protect your digital rights
User avatar
stev
Legit Extremist
Legit Extremist
 
Posts: 1507
Joined: Thu Feb 16, 2006 7:29 am
Location: Nashville, TN suburbs

Re: Can I plug a 4 pin fan into a 3 pin header? (PWM)

Postby FormatC » Fri Sep 14, 2007 8:43 pm

Is there a circuit I can make to simulate a 4 pin MB header? and if the fan does work at all with the full 12 Volts will it run at full speed?
Computers are a lot like air conditioners - they both work great until you open up windows.
FormatC
Legit User
Legit User
 
Posts: 22
Joined: Tue Oct 04, 2005 3:20 am

Re: Can I plug a 4 pin fan into a 3 pin header? (PWM)

Postby stev » Mon Sep 17, 2007 5:07 pm

FormatC wrote:Is there a circuit I can make to simulate a 4 pin MB header? and if the fan does work at all with the full 12 Volts will it run at full speed?


http://www.analog.com/library/analogdia ... speed.html

Or the cheap and easy way. :)
http://www.bit-tech.net/modding/2001/12 ... ntroller/1

If you prefer, get one at a good price at Frozen.CPU or the Zalman made unit to save time and any hassels. (Zalman ZM-MFC2 Multi Fan Controller)

http://www.frozencpu.com/cat/l3/g34/c17 ... Page1.html

A fan controller with PWM isn't an easy thing to find, but not impossible. So shop around.

Vantec Nexus and Sunbeam Rheobus are PWM fan controllers to consider too.
AMD X2 TK-57 1.90Ghz | F700 Quanta | PC2-5300 DDR2 2Gb | GeForce 7000M | DVDRAM GSA-T40N | HP LaserJet 1018
My Stats http://folding.extremeoverclocking.com/extra_page.php?s=&u=303718
Image
http://www.eff.org - Electronic Frontier Foundation - working to protect your digital rights
User avatar
stev
Legit Extremist
Legit Extremist
 
Posts: 1507
Joined: Thu Feb 16, 2006 7:29 am
Location: Nashville, TN suburbs


Return to Cases, Power Supplies, and Cooling

Who is online

Users browsing this forum: No registered users and 0 guests