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How to attach 4 pin CPU fan to 3 pin?

post #1 of 21
Thread Starter 
Not a motherboard header! I need to attach a 4 pin CPU fan to a 3 pin header on a fan controller. Unfortunately the 3 pin header on the Fan Controller is shaped like a socket, so a 4 pin is too large (unlike a motherboard header where its just pins sticking out).

And technically, the fan controller is only using 2 pin (ie it has 3 pin and molex on it but only 2 pins sticking out on each) for a yellow and ground.

I just need help figuring out where the wires go. I stuck black to black and yellow to yellow, and that didn't work, and I stuck black to black and yellow to red, the same way that it would hook up as if the CPU fan could fit, and it didnt work.

The fan just kinda rocks back and forth, and bugs out. It doesnt really spin at all.

Help please. If you say buy an adapter or tell me to stick it into the motherboard I'm going to tear your head off biggrin.gif Dont worry about it, very long story short that isn't an option and I just need this question answered.
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post #2 of 21
It's possible that the fan controller isn't providing enough power for the fan, thus why it is simply rocking back and forth. While the fan controller may be rated at the same power as the fan, usually the fan takes more power to start up then is needed to maintain while rotating.
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post #3 of 21
Demanding that we help you out isn't going to work, what fan do you have and what fan controller do you have?
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post #4 of 21
Thread Starter 
Sorry, I didn't mean to sound like I was demanding anything - I just am asking not to get a bucnh of 'plug it into cpu header' and 'whats wrong with you spend money buy mor fanz'.

The situation is I have 7 fans total - 5 3pins (120mm nzxt stock case fan and 4 Yates) and 2 cpu fans. I want to control them aol, but what's REALLY omportant is that I control the 2 cpu fans, as they are just the absolute loudest.

I have the NZXT sentry 2 which controls 5 fans via 3 pin or molex with just 2 ppins (12v and ground). My motherboard only has a single cpu header, but I have 2 cpu fans, one is a case fan and one is a modded spot cooler, tied to my northbridge that needed cooling due to tower not cooling it like my stock radial hsf did.

Now I've done all the mathm don't bother, here's my options:
1. Figure out how to wire 4pin to a 3pin/molex by snipping things apart.
2. Somehow sniop things apart and link the 2 cpu fans, thus 'sharing' the voltage and in effect lowering their speed and most importantly, sound.
3. Remove my 4pin 120 mm, and then have only 1 cpu fan, and have on e less fan.
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post #5 of 21
Having 'done the math' will your motherboard CPU fan header support both fans?
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post #6 of 21
Can you not mod the socket on the fan controller to allow you to fit the 4 pin fan on to it?
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post #7 of 21
Thread Starter 
Quote:
Having 'done the math' will your motherboard CPU fan header support both fans?

Theres no reason a fan header can't support 2 fans. I think 3+ is when daisychaining fans on a header is an issue.
Quote:
Can you not mod the socket on the fan controller to allow you to fit the 4 pin fan on to it?

I've attached the wires in the way that would happen if I had modded the socket (grnd to grnd and red to yellow) and it doesn't work. It sorta rocks back and forth, like it isn't getting enough power.
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post #8 of 21
Are both fans PWM fans?
Edited by Arctucas - 3/15/11 at 9:30am
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post #9 of 21
Thread Starter 
Yes, I believe they are PWM fans. One is black yellow green blue, the other is yellow black blue red. it doesn't matter which fan I need to snip snip, I just need to be able to control one with the NZXT Sentry 2 fan controller 3pin/molex which is just using 2 pins on each (black/yellow).

The problem is that none of my fans are really that loud, except the CPU fans. I wouldn't mind if I could rig it somehow so they ran at 5v or 7v as opposed to 12v to slow them down - they are just too loud and I want to make them unloud.

I'm considering just removing the 120mm CPU fan, replacing that rear exhaust with a yateloon, and then just have 1 less intake fan (as the re-moved 120mm yate loon is no longer an extra intake). But that'd totally suck frown.gif
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Sanyo DP19640 18.5" 768p KDS Rad-7xp 1024p CM Storm Quickfire Rapids Brown Rosewill Capstone 750 
CaseMouseMouse PadAudio
Bitfenix Shinobi Modded CM Storm Spawn Steelseries Diablo 3 2 set CD Speaker + Big Sub 
Other
Bitfenix Recon Fan Controller Moded 
CPUMotherboardGraphicsRAM
Delidded i7-3770K 5GHz@1.499 Gigabyte Z77X-UD5H 1.1 Sapphire Dual-X 7950 3L Boost 4x2GB Mushkin Ridgeback 2200mhz 8/11/8/27 1.75v... 
Hard DriveCoolingCoolingCooling
Intel X25-M 80GB SSD NH-D14 SE2011 Noctua 120/140/140 Fans 3 x Yate Loon Mediums (Petras) 2 x NZXT Havik 140mm Fans 
OSMonitorMonitorKeyboard
Hax'd W7 Ultimate 64-bit Sanyo DP19640 19'' KDS Radius Rad-7xp 17'' Ducky 1087 MX Brown 10keyless 
PowerCaseMouseMouse Pad
Rosewill Capstone 550w Modular NZXT Source 210 w/Modded Window Razer Deathadder 3.5G Steelseries Blizzcon D3 
AudioAudioOtherOther
Phillips FW-C250 2 Speaker Set w/3 CD Changer JBL Sub 6 Subwoofer NZXT Sleeved LED Strip 1m Blue NZXT Sentry 2 Fan Controller 
Other
Colonial Blue Paracord Sleeving 
CPUMotherboardGraphicsRAM
Phenom ii X4 955C2, $31, 5 broken pins, works! ... Biostar A770e3 6.3 Red&Black MSI GTX 460 768mb Twin Frozr II 2 x 2GB Kingston HyperX 1333 OC to 1348CL7@1.65v 
Hard DriveCoolingCoolingCooling
Intel X25-M G2 80GB SSD NH-D14 SE2011 6 x Case Fans (4 x YL-M, NZXT case fan, CM Hype... Jerryrigged Chipset-Northbridge 80mm HSF 
CoolingOSMonitorKeyboard
Jerryrigged VRM Heatsink (sawed off stock AM2 h... Hax'd W7 Ultimate 64bit Sanyo DP19640 19"1360x768 Ducky Cherry Browns 10keyless 
PowerCaseMouseMouse Pad
Antec Earthwatts 430D NZXT Gamma Steelseries Kinzu Optical Steelseries Blizzcon Diablo 3 
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Build In Progress
(17 items)
 
   
CPUMotherboardGraphicsRAM
Haswell i7-4770K 4.8GHz@1.452v/1.97vRIN Gigabyte Z87X-UD3H Older Gigabyte 7950 (H60 Mod) 2x4GB Gskill 2400CL11 Hynix CFRs 
Hard DriveCoolingOSMonitor
Samsung 830 128gb Corsair H110 w/4x 140mm Yate Loon High Blues W7 x64 Ultimate Yarrgh Matey Dell U2312HM Matte IPS 1080p 
MonitorMonitorKeyboardPower
Sanyo DP19640 18.5" 768p KDS Rad-7xp 1024p CM Storm Quickfire Rapids Brown Rosewill Capstone 750 
CaseMouseMouse PadAudio
Bitfenix Shinobi Modded CM Storm Spawn Steelseries Diablo 3 2 set CD Speaker + Big Sub 
Other
Bitfenix Recon Fan Controller Moded 
CPUMotherboardGraphicsRAM
Delidded i7-3770K 5GHz@1.499 Gigabyte Z77X-UD5H 1.1 Sapphire Dual-X 7950 3L Boost 4x2GB Mushkin Ridgeback 2200mhz 8/11/8/27 1.75v... 
Hard DriveCoolingCoolingCooling
Intel X25-M 80GB SSD NH-D14 SE2011 Noctua 120/140/140 Fans 3 x Yate Loon Mediums (Petras) 2 x NZXT Havik 140mm Fans 
OSMonitorMonitorKeyboard
Hax'd W7 Ultimate 64-bit Sanyo DP19640 19'' KDS Radius Rad-7xp 17'' Ducky 1087 MX Brown 10keyless 
PowerCaseMouseMouse Pad
Rosewill Capstone 550w Modular NZXT Source 210 w/Modded Window Razer Deathadder 3.5G Steelseries Blizzcon D3 
AudioAudioOtherOther
Phillips FW-C250 2 Speaker Set w/3 CD Changer JBL Sub 6 Subwoofer NZXT Sleeved LED Strip 1m Blue NZXT Sentry 2 Fan Controller 
Other
Colonial Blue Paracord Sleeving 
CPUMotherboardGraphicsRAM
Phenom ii X4 955C2, $31, 5 broken pins, works! ... Biostar A770e3 6.3 Red&Black MSI GTX 460 768mb Twin Frozr II 2 x 2GB Kingston HyperX 1333 OC to 1348CL7@1.65v 
Hard DriveCoolingCoolingCooling
Intel X25-M G2 80GB SSD NH-D14 SE2011 6 x Case Fans (4 x YL-M, NZXT case fan, CM Hype... Jerryrigged Chipset-Northbridge 80mm HSF 
CoolingOSMonitorKeyboard
Jerryrigged VRM Heatsink (sawed off stock AM2 h... Hax'd W7 Ultimate 64bit Sanyo DP19640 19"1360x768 Ducky Cherry Browns 10keyless 
PowerCaseMouseMouse Pad
Antec Earthwatts 430D NZXT Gamma Steelseries Kinzu Optical Steelseries Blizzcon Diablo 3 
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post #10 of 21
OK, I thought you wanted to use the motherboard header?

Do you not want the fan speed to be relative to CPU temperature?
PC
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i7-6700K eVGA Classified K eVGA GTX970SSC G.Skill F4-3600C16-16GTZ 
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2x Samsung 960 EVO M.2 RAID0 Samsung SH-S223L Custom Loop D5 Vario, Thermochill PA140.3, Heat... W7 U SP1 x64 
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Viewsonic VX2770 Logitech Corsair AX1200, APC RS1500 LCD Thermaltake VG4000SNA  
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Logitech 
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PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K eVGA Classified K eVGA GTX970SSC G.Skill F4-3600C16-16GTZ 
Hard DriveOptical DriveCoolingOS
2x Samsung 960 EVO M.2 RAID0 Samsung SH-S223L Custom Loop D5 Vario, Thermochill PA140.3, Heat... W7 U SP1 x64 
MonitorKeyboardPowerCase
Viewsonic VX2770 Logitech Corsair AX1200, APC RS1500 LCD Thermaltake VG4000SNA  
Mouse
Logitech 
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Overclock.net › Forums › Cooling › Air Cooling › How to attach 4 pin CPU fan to 3 pin?