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How to connect 2 or more fans into one connector?

post #1 of 19
Thread Starter 
The questions are:

How to connect (by soldering) 2 or more fans together if they are:
1.a) both 2-pin
1.b) both 3-pin
1.c) both 4-pin
1.d) 2-pin & 3-pin
1.e) 2-pin & 4-pin
1.f) 3-pin & 4-pin

to make them work without any problems with:
2.a) 4-pin mainboard header (for examples: 1.c, 1.e, 1.f)
2.b) 3-pin mainboard header (for examples: 1.b, 1.d)
2.c) 3-pin fan controller (for examples: 1.b, 1.d)

Connectors & Cables:
2-pin: red, black
3-pin: yellow, red, black
4-pin: blue, yellow, red, black

By "work without any problems" I mean to make them work with mainboard which lets the RPMs to be controlled and with 3-pin fan controller.

Which cables to connect together (solder) to let them work in given examples? I hope you know what I mean wink.gif

Sorry for my not-so-good English, that's not my native language.
post #2 of 19
Just buy a Y splitter cable...
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post #3 of 19
I just get some new pins from Frozen CPU, cut the old ones off and place two wires per new pin. It has worked every time for me, no issues.

Connector Pins

Tools that work excellent:

4-Pin Molex

Pretty much anything else

As far as what colors to match up, well as simplistic as it sounds, most wires are color-coded the same for the same components. If you have one extra wire on one fan than the other you intend to splice it into, just don't splice the one wire who's color is missing on the other......i.e.

One fan has two cables (Red/Black)
The other fan has three (Red/Black/Yellow)

....splice the red with the corresponding red wire / black with the corresponding black wire and do nothing with the yellow. I would recommend against splicing together two different model fans, they may have different specifications as to current and may not be a great idea.
Edited by Canis-X - 7/12/11 at 11:04am
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JimBob [Main Rig]
(27 items)
 
 
COOTER [HTPC]
(14 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7 3930k RAMPAGE IV EXTREME ASUS GeForce GTX 590 (x2 for quad-SLi) Samsung 30nm 8 x 4GB sticks 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 Pro Series 256GB (2 in RAID 0) 300GB WD Velociraptor (4 in RAID 0) Seagate Barracuda 3TB 7200RPM SATA3 64MB LG Super Multi Blu-ray Disc and HD DVD-ROM Drive 
CoolingCoolingCoolingCooling
CPU Cooler [Summer-Time] = Watercool HEATKILLER... CPU Cooler [Winter-Time] = Custom 300W ss phase... EK ASUS Rampage IV Extreme Full Board Cooling B... XSPC Razor GTX590 - Full Cover VGA Water-Block ... 
CoolingCoolingCoolingCooling
Hardware Labs Black Ice GTX 480 Radiator (4 x 1... Feser X-Changer Triple (3 x 120mm) Swiftech MCP655 (x2) Koolance RP-452X2 Dual 5.25" Reservoir 
OSMonitorKeyboardPower
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Xigmatek Elysium [Black w/ Window] RAZER DeathAdder X Trac Ripper HT | OMEGA eCLARO 7.1 
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CPUMotherboardGraphicsRAM
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Hard DriveHard DriveOptical DriveCooling
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CaseMouseAudio
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AMD A6-3650 ASUS F1A75-M-PRO R2.0 AMD Radeon HD 6530D Samsung 30nm 2 x 4GB sticks 
Hard DriveHard DriveOptical DriveCooling
120GB Samsung 840 Western Digital Red 3TB SATA3 64MB Cache 3.5in ... LG Super Multi Blu-ray Disc and HD DVD-ROM Drive Cooler Master GeminII M4 - CPU Cooler 
CoolingOSMonitorKeyboard
Noctua NF-R8 80mm Fans Win7 SP1 64bit Visio 50" Plasma Logitech Mini Controller for Logitech Revue and... 
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post #4 of 19
Just match up the red and black wires, each fan needs both obviously. You should have the yellow wire from just one fan plugged into the motherboard so the RPM is reported correctly. I'm not sure how the PWM (blue wire) signal works, so I can't say for sure about that one.
post #5 of 19
What I do is I just pull off the pins, then straighten up one of them so it would fit *within* the other (black w/ black, red w/ red, of course smile.gif ), push them back in the plastic holder and connect it smile.gif Works flawlessly, no need to solder.

And always connect just 1 of the tachometer (yellow) cables, otherwise readings are far off. I use tape to keep the other yellow cable from dingling within the case smile.gif
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post #6 of 19
Thread Starter 
Quote:
Originally Posted by qhduong92;14190351 
Just buy a Y splitter cable...

I want to do it by myself. Also I don't want to add any extra splitters, I want to make it look tidy, with sleeves and so on.
Quote:
Originally Posted by Canis-X;14190360 
I just get some new pins from Frozen CPU

I'm not from USA so I can't buy it there but I'll try to find that pins somewhere here. Thanks!
Quote:
Originally Posted by t-ramp;14190388 
You should have the yellow wire from just one fan plugged into the motherboard so the RPM is reported correctly.

So when I join 2 identical 3-pin fans I should join black&black, red&red and I should not to join yellow cables and let only one fan to report RPMs to mainboard? What will happen if I connect them as well? The RPMs will be doubled and the mainboard will show me that for example fans run at 3k rpm instead of 1,5k?
post #7 of 19
Quote:
Originally Posted by jodgus;14190467 
So when I join 2 identical 3-pin fans I should join black&black, red&red and I should not to join yellow cables and let only one fan to report RPMs to mainboard? What will happen if I connect them as well? The RPMs will be doubled and the mainboard will show me that for example fans run at 3k rpm instead of 1,5k?

Please refer to my last post according the yellow cables. I joined them the first time, the reults were unpleasant. smile.gif
Quote:
Originally Posted by ronnin426850;14190449 
What I do is I just pull off the pins, then straighten up one of them so it would fit *within* the other (black w/ black, red w/ red, of course smile.gif ), push them back in the plastic holder and connect it smile.gif Works flawlessly, no need to solder.

And always connect just 1 of the tachometer (yellow) cables, otherwise readings are far off. I use tape to keep the other yellow cable from dingling within the case smile.gif

I can post pics on how I'm doing it, it's really tidy and easy to undo, no need to solder.
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Wife's D3 machine
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post #8 of 19
Thread Starter 
Pics will be great smile.gif

3. How many fans can I join together at the same time if they:
3.a) are connected to MB
3.b) are connected to fan controller?

I don't want to damage a MB neither a fan controller.

4. If I join 2 fans - are they working with the same speed as single or the speed is reduced somehow?
post #9 of 19
Quote:
Originally Posted by jodgus;14190561 
Pics will be great smile.gif

3. How many fans can I join together at the same time if they:
3.a) are connected to MB
3.b) are connected to fan controller?

I don't want to damage a MB neither a fan controller.

4. If I join 2 fans - are they working with the same speed as single or the speed is reduced somehow?

Why don't you connect them to an HDD molex? I find them perfect for the job for 2 reasons:

1) The pins of the fan fit Perfectly in the hole of the molex connector
2) The PSU provides 20A to those 12v, so you can practically attach any number of fans you like without risking to burn anything.

If it has to go though a controller first... I don't know. I've only tried 2 fans at a time, connected to a standard fan port or controller.
I have 3 now attached to the molex, 2 of which are high performance.

Pics will take some time.. Will post with em soon smile.gif

EDIT: To your last question - if you join them in parallel, they will work on their certified speed, with a higher risk to the power supply circuit. If you join them in sequence (red to black), they will work on half speed.
Edited by ronnin426850 - 7/12/11 at 11:38am
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Wife's D3 machine
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Dream Rig
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WD Scorpio Blue 250Gb LiteOn DVD-RW CoolerMaster Hyper Z600 Win 7 Home Premium 
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LG E2240S DeLUX FSP Hexa 500 MS-Tech CA-0130 Black 
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post #10 of 19
Thread Starter 
Quote:
Originally Posted by ronnin426850;14190696 
Why don't you connect them to an HDD molex?
Because then I couldn't control the rpm. I want to upgrade my rig with a new case that can handle up to 6 fans. Also I want my rig to be as silent as possible when idle / not demanding tasks and as cool as possible during gaming / stress.

The fans which I want to buy are:
- 12V
- 0.2A
- 2.4W
- 1500rpm
- 120mm
- 21dB
- 65CFM
- 6V start voltage
Edited by jodgus - 7/12/11 at 11:47am
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