• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

2 fans off 1 header?

  • Thread starter Deleted member 24505
  • Start date
Joined
May 28, 2005
Messages
4,994 (0.73/day)
Location
South of England
System Name Box of Distraction
Processor Ryzen 7 1800X
Motherboard Crosshair VI Hero
Cooling Custom watercooling
Memory G.Skill TridentZ 2x8GB @ 3466MHz CL14 1T
Video Card(s) EVGA 1080Ti FE. WC'd & TDP limit increased to 360W.
Storage Samsung 960 Evo 500GB & WD Black 2TB storage drive.
Display(s) Asus ROG Swift PG278QR 27" 1440P 165hz Gsync
Case Phanteks Enthoo Pro M
Audio Device(s) Phillips Fidelio X2 headphones / basic Bose speakers
Power Supply EVGA Supernova 750W G3
Mouse Logitech G602
Keyboard Cherry MX Board 6.0 (mx red switches)
Software Win 10 & Linux Mint
Benchmark Scores https://hwbot.org/user/infrared
Yep, unless they're really high power server fans they should be fine, the mobo manual should mention somewhere what the max rating is, iirc it's usually about 1Amp per header which is quite a lot when it comes to fans. I bought the connectors and crimp up my own y leads, just missing off the RPM signal wire from one, so far I've never had any prob running 2x 120mm EK vardar or corsair ML fans off a single header. :)
Yes it is. I have 3 fans and 1 pump in 1 Motherboard 4 pin fan header.
Wow, I'm actually quite impressed it's managing that, goes to show i guess.
 
Joined
Nov 24, 2017
Messages
853 (0.37/day)
Location
Asia
Processor Intel Core i5 4590
Motherboard Gigabyte Z97x Gaming 3
Cooling Intel Stock Cooler
Memory 8GiB(2x4GiB) DDR3-1600 [800MHz]
Video Card(s) XFX RX 560D 4GiB
Storage Transcend SSD370S 128GB; Toshiba DT01ACA100 1TB HDD
Display(s) Samsung S20D300 20" 768p TN
Case Cooler Master MasterBox E501L
Audio Device(s) Realtek ALC1150
Power Supply Corsair VS450
Mouse A4Tech N-70FX
Software Windows 10 Pro
Benchmark Scores BaseMark GPU : 250 Point in HD 4600
is it ok to run 2 fans of the same type off 1 motherboard fan header?
Yes, if combined power of two fans dont exceed 12W power.
 
Joined
Feb 6, 2010
Messages
1,720 (0.33/day)
Location
Steel City, UK
Yep, unless they're really high power server fans they should be fine, the mobo manual should mention somewhere what the max rating is, iirc it's usually about 1Amp per header which is quite a lot when it comes to fans. I bought the connectors and crimp up my own y leads, just missing off the RPM signal wire from one, so far I've never had any prob running 2x 120mm EK vardar or corsair ML fans off a single header. :)

Wow, I'm actually quite impressed it's managing that, goes to show i guess.

Yeap on my fractal design celsius s36 it has 4 4pin hub stick into the rad and connected straight to the pump from pump to mobo header.
 

Attachments

  • HS00BFD_166052_800x800.jpg
    HS00BFD_166052_800x800.jpg
    152.3 KB · Views: 714
Joined
Dec 6, 2005
Messages
10,881 (1.63/day)
Location
Manchester, NH
System Name Senile
Processor I7-4790K@4.8 GHz 24/7
Motherboard MSI Z97-G45 Gaming
Cooling Be Quiet Pure Rock Air
Memory 16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card(s) GIGABYTE Vega 64
Storage Samsung EVO 500GB / 8 Different WDs / QNAP TS-253 8GB NAS with 2x10Tb WD Blue
Display(s) 34" LG 34CB88-P 21:9 Curved UltraWide QHD (3440*1440) *FREE_SYNC*
Case Rosewill
Audio Device(s) Onboard + HD HDMI
Power Supply Corsair HX750
Mouse Logitech G5
Keyboard Corsair Strafe RGB & G610 Orion Red
Software Win 10
Joined
Nov 24, 2017
Messages
853 (0.37/day)
Location
Asia
Processor Intel Core i5 4590
Motherboard Gigabyte Z97x Gaming 3
Cooling Intel Stock Cooler
Memory 8GiB(2x4GiB) DDR3-1600 [800MHz]
Video Card(s) XFX RX 560D 4GiB
Storage Transcend SSD370S 128GB; Toshiba DT01ACA100 1TB HDD
Display(s) Samsung S20D300 20" 768p TN
Case Cooler Master MasterBox E501L
Audio Device(s) Realtek ALC1150
Power Supply Corsair VS450
Mouse A4Tech N-70FX
Software Windows 10 Pro
Benchmark Scores BaseMark GPU : 250 Point in HD 4600

AsRock

TPU addict
Joined
Jun 23, 2007
Messages
18,851 (3.08/day)
Location
UK\USA
Processor AMD 3900X \ AMD 7700X
Motherboard ASRock AM4 X570 Pro 4 \ ASUS X670Xe TUF
Cooling D15
Memory Patriot 2x16GB PVS432G320C6K \ G.Skill Flare X5 F5-6000J3238F 2x16GB
Video Card(s) eVga GTX1060 SSC \ XFX RX 6950XT RX-695XATBD9
Storage Sammy 860, MX500, Sabrent Rocket 4 Sammy Evo 980 \ 1xSabrent Rocket 4+, Sammy 2x990 Pro
Display(s) Samsung 1080P \ LG 43UN700
Case Fractal Design Pop Air 2x140mm fans from Torrent \ Fractal Design Torrent 2 SilverStone FHP141x2
Audio Device(s) Yamaha RX-V677 \ Yamaha CX-830+Yamaha MX-630 Infinity RS4000\Paradigm P Studio 20, Blue Yeti
Power Supply Seasonic Prime TX-750 \ Corsair RM1000X Shift
Mouse Steelseries Sensei wireless \ Steelseries Sensei wireless
Keyboard Logitech K120 \ Wooting Two HE
Benchmark Scores Meh benchmarks.
Yes, just make sure you stay away from the max amps on the motherboard fan header. To find out what that is you might have to contact the manufacture.

Well most motherboards fan header support 1A. Though some board support more power as you mentioned.

Personally i would not go over that, better safe than sorry.
 
Joined
Mar 18, 2015
Messages
2,960 (0.90/day)
Location
Long Island
Is it OK to drink a bottle eat 6 candy bars ... kinda depends on how big those bars are :)

Your header is likely rated for one amp. A typical 140mm 1250 rpm case fan is rated for about 0.14 amps. You probably should account for inrush current but the manufacturers already do that, well at least some do, so not that big of a worry most of the time. Some high end boards will have one or mor 2A headers.

So, again, using that typical 140mm 1250 rpm fan @ 0.14 amps.

I have a 420 rad in push / pull and my logic went like this.

1250 rpm fans ... use 83% of header rating to account for inrush current
1500 rpm fans ... use 75% of header rating to account for inrush current.
1800 rpm fans ... use 67% of header rating to account for inrush current.
2200 rpm fans ... use 58% of header rating to account for inrush current.

Again, the way most control schemes go these days, they ramp the speed up to minimize inrush and there's a bit of beefiness built in to handle inrush anyway so I would not be too concerned if ya exceed that with modern fans / MoBos.

So, for my 420 rad w/ twin 140mm 1250 rpm fans in push pull, my target was 0.83 amps.
6 fans on 420 rad x 0.14 = 0.84 amps ~ 0.83 OK

They been spinning 24/7 for 5.5 years. Well not really, all fans turn off when CPU temps are < 40. When load is applied they ramp up over about 30 seconds and ramp down over 90 when load is removed so as to clear latent heat from coolant.... that perty much eliminates any inrush concerns and the fanms nver break 850 rpm anyway.

I recommend hubs over splitter cables, hubs are less messy and cables market is loaded with poor quality sudd.

You need different types of devices to do this:

a) DCV fans w/ DCV header - 3-Pin Male to 3 x 3-pin Male or 3-Pin Male to 5 x 3-pin Male
No aux power should be used
http://www.modmy.toys/pcb.html

b) PWM fans with PWM header
If exceeding 1 amp, can use aux power connector
https://www.swiftech.com/8-WayPWMsplitter-sata.aspx

c) DCV Fans with PWM **or** DCV Header
Use up to (6) DCV (0.14) fans with full speed control from PWM header and no aux power
Use up to (8) DCV (< 1.0 amp total) ) fans with full speed control from PWM header with aux power
Use up to (6) DCV (0.14) fans with full speed control from DCV header and no aux power
https://www.newegg.com/Product/Product.aspx?Item=N82E16811984004
 
D

Deleted member 24505

Guest
Thank you for all replys.

so I can wire the 2 x 4 pin Corsair AF 140 on one header with just one rpm wire connected?
 
Joined
Mar 18, 2015
Messages
2,960 (0.90/day)
Location
Long Island
Well there are a few versions ....

DCV Air Series™ AF140 Quiet Edition High Airflow 140mm Fan = 0.10amps
https://www.corsair.com/us/en/Categ...flow-140mm-Fan/p/CO-9050009-WW#tab-tech-specs

DCV Air Series™ AF140 LED (2018) White 140mm Fan Single Pack = 0.30 amps
https://www.corsair.com/us/en/Categ...se-Cooling-Fan/p/CO-9050085-WW#tab-tech-specs

http://www.performance-pcs.com/modmytoys-3-pin-power-distribution-pcb-3-way-block.html

This PCB may requires you to manage the rpm thing for 2nd fan yaself ....
https://allpinouts.org/pinouts/connectors/motherboards/motherboard-cpu-3-pin-fan-connector/

With this one, it's all done for you inside the PCB
https://www.newegg.com/Product/Product.aspx?Item=9SIA4RE5032993
 

Chloefile

S.T.A.R.S.
Joined
Dec 16, 2012
Messages
10,878 (2.64/day)
Location
Finland
System Name 4K-gaming
Processor AMD Ryzen 7 5800X
Motherboard Gigabyte B550M Aorus Elite
Cooling Custom loop (CPU+GPU, 240 & 120 rads)
Memory 32GB Kingston HyperX Fury @ DDR4-3466
Video Card(s) PowerColor RX 6700 XT Fighter
Storage ~4TB SSD + 6TB HDD
Display(s) Acer 27" 4K120 IPS + Lenovo 32" 4K60 IPS
Case Fractal Design Define Mini C
Audio Device(s) Asus TUF H3 Wireless
Power Supply EVGA Supernova G2 750W
Mouse Logitech MX518 Legendary
Keyboard Roccat Vulcan 121 AIMO
VR HMD Oculus Rift CV1
Software Windows 11 Pro
Benchmark Scores It runs Crysis remastered at 4K
I have 2x Corsair ML120 and 2x be quiet! PWM fans with both twins using one header with a splitter. No problems.

so I can wire the 2 x 4 pin Corsair AF 140 on one header with just one rpm wire connected?
Yes. :)
 
D

Deleted member 24505

Guest

I think i might look for a fan hub or controller with some sort of rpm display. All together I have 6 140mm fans in my case.
 
Joined
Mar 18, 2015
Messages
2,960 (0.90/day)
Location
Long Island
I have a Reeven Six Eyes which i used just to display cooalnt temps (rad 1 In, rad 1 Out, rad 2 in, rad 2 out, Ambient and case interior. The most common usage is to use it as a manual fan controller .... you turn the knobs and manually control rpm , I have not tried it just displaying the rpm, but don't see why it couldn't be done. Would require some extra wiring thoi

But why bother ? FanXpert 2 comes with the MoBo (On the DVD that came in the box) .... watch the video

h*ttps://www.youtube.com/watch?v=4i-aTUMuIB0

Copy / paste the link into your browser window and then delete the asterisk between the h and the t
 
Joined
Mar 18, 2015
Messages
2,960 (0.90/day)
Location
Long Island
1st one looks like Molex or 4 pin DCV (no yellow wire) input and six 3 pin DCV outputs

2nd one could be a 4 pin PWM input (but I don't see a yellow wire) to 3 pin DCV with 12v aux power. The white connector sends back the rpm signal.

3rd one looks like Molex to .... (this is an odd one)

4 x 3 pin fan (7 - 12v)

... 2 x 4 pin DCV (5 - 12v)
... 4 x 3 pin DCV (5 - 12v)
... 4 x 3 pin DCV (12v full speed only)
 
Joined
Jul 5, 2013
Messages
25,559 (6.52/day)
is it ok to run 2 fans of the same type off 1 motherboard fan header?
Yes. Fans don't draw a bunch of power and it is safe to run 3 or 4 from one header. However...
and 1 pump in 1 Motherboard 4 pin fan header.
...this is really pushing it. Pumps do need a lot of power. Such a power draw might cause issues long term.. Try not to do this. Give a pump it's own dedicated connector.
 
Top