Jump to content

Question about fan splitter.

SleepingGiant20
By SleepingGiant20
in Cooling
 Share
Posted

So today I bought a fan splitter for my 3 pin fans. Splitter has 4 pin connector which connects to motherboard, other two are for fans and they are 4 pin and 3 pin.

That 3 pin connector is very weird because it isn't a tipical 3 pin fan header. It has 2 pins , then empty space and then the last pin.

Can I connect 3 pin fan to 2 pins?

IMG_20200528_132335.thumb.jpg.b29f9e55641533efe3ed3be7ac2064eb.jpg

IMG_20200528_132243.jpg

IMG_20200528_132329.jpg

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

yes you can use 3 pin fans on a 4 pin header. the point of missing the pin if I'm not mistaken is to only report back 1 RPM

Good luck, Have fun, Build PC, and have a last gen console for use once a year. I should answer most of the time between 9 to 3 PST

NightHawk 3.0: R7 5700x @, B550A vision D, H105, 2x32gb Oloy 3600, Sapphire RX 6700XT  Nitro+, Corsair RM750X, 500 gb 850 evo, 2tb rocket and 5tb Toshiba x300, 2x 6TB WD Black W10 all in a 750D airflow.
GF PC: (nighthawk 2.0): R7 2700x, B450m vision D, 4x8gb Geli 2933, Strix GTX970, CX650M RGB, Obsidian 350D

Skunkworks: R5 3500U, 16gb, 500gb Adata XPG 6000 lite, Vega 8. HP probook G455R G6 Ubuntu 20. LTS

Condor (MC server): 6600K, z170m plus, 16gb corsair vengeance LPX, samsung 750 evo, EVGA BR 450.

Spirt  (NAS) ASUS Z9PR-D12, 2x E5 2620V2, 8x4gb, 24 3tb HDD. F80 800gb cache, trueNAS, 2x12disk raid Z3 stripped

PSU Tier List      Motherboard Tier List     SSD Tier List     How to get PC parts cheap    HP probook 445R G6 review

 

"Stupidity is like trying to find a limit of a constant. You are never truly smart in something, just less stupid."

Camera Gear: X-S10, 16-80 F4, 60D, 24-105 F4, 50mm F1.4, Helios44-m, 2 Cos-11D lavs

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

The first 2 pins are power connectors, the 3rd pin (missing one) is the rpm sensor and the 4th one is the pwm connector.

 

You can use the splitter to split to two fans but you will of course only get the rpm readout from one fan.

If someone did not use reason to reach their conclusion in the first place, you cannot use reason to convince them otherwise.

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author
Just now, GDRRiley said:

yes you can use 3 pin fans on a 4 pin header. the point of missing the pin if I'm not mistaken is to only report back 1 RPM

I know that I can use 3 pin fans on a 4 pin header, but can I use 3 pin fans on a 2 pin header?

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author
1 minute ago, Stahlmann98 said:

The first 2 pins are power connectors, the 3rd pin (missing one) is the rpm sensor and the 4th one is the pwm connector.

 

You can use the splitter to split to two fans but you will of course only get the rpm readout from one fan.

I was worried that I got broken pin header. Thank you!

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
2 minutes ago, GDRRiley said:

yes you can use 3 pin fans on a 4 pin header. the point of missing the pin if I'm not mistaken is to only report back 1 RPM

Yup, pin 3 is 'sense', to see how fast a fan is moving. The motherboard expects to get speed back from one fan, which is why it's only on one of the male ends.

1 minute ago, SleepingGiant20 said:

I know that I can use 3 pin fans on a 4 pin header, but can I use 3 pin fans on a 2 pin header?

Yes.

Pin 2 is used for speed control (be sure to set your motherboard to DC control on that header). Pin 3 is to ask one fan how fast it is moving.

 

Keep in mind with a splitter, all connected fans to that splitter will move at the same speed.

"We're all in this together, might as well be friends" Tom, Toonami.

 

mini eLiXiVy: my open source 65% mechanical PCB, a build log, PCB anatomy and discussing open source licenses: https://linustechtips.com/topic/1366493-elixivy-a-65-mechanical-keyboard-build-log-pcb-anatomy-and-how-i-open-sourced-this-project/

 

mini_cardboard: a 4% keyboard build log and how keyboards work: https://linustechtips.com/topic/1328547-mini_cardboard-a-4-keyboard-build-log-and-how-keyboards-work/

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author
2 minutes ago, minibois said:

Yup, pin 3 is 'sense', to see how fast a fan is moving. The motherboard expects to get speed back from one fan, which is why it's only on one of the male ends.

Yes.

Pin 2 is used for speed control (be sure to set your motherboard to DC control on that header). Pin 3 is to ask one fan how fast it is moving.

 

Keep in mind with a splitter, all connected fans to that splitter will move at the same speed.

So, if I have two 3 pin fans, one can spin max at 1500 rpm and the other one at 1000 rpm, both are going to spin at 1000 rpm?

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
Just now, SleepingGiant20 said:

So, if I have two 3 pin fans, one can spin max to 1500 rpm and the other on at 1000 rpm, both are going to spin at 1000 rpm?

No both would spin their max 

Good luck, Have fun, Build PC, and have a last gen console for use once a year. I should answer most of the time between 9 to 3 PST

NightHawk 3.0: R7 5700x @, B550A vision D, H105, 2x32gb Oloy 3600, Sapphire RX 6700XT  Nitro+, Corsair RM750X, 500 gb 850 evo, 2tb rocket and 5tb Toshiba x300, 2x 6TB WD Black W10 all in a 750D airflow.
GF PC: (nighthawk 2.0): R7 2700x, B450m vision D, 4x8gb Geli 2933, Strix GTX970, CX650M RGB, Obsidian 350D

Skunkworks: R5 3500U, 16gb, 500gb Adata XPG 6000 lite, Vega 8. HP probook G455R G6 Ubuntu 20. LTS

Condor (MC server): 6600K, z170m plus, 16gb corsair vengeance LPX, samsung 750 evo, EVGA BR 450.

Spirt  (NAS) ASUS Z9PR-D12, 2x E5 2620V2, 8x4gb, 24 3tb HDD. F80 800gb cache, trueNAS, 2x12disk raid Z3 stripped

PSU Tier List      Motherboard Tier List     SSD Tier List     How to get PC parts cheap    HP probook 445R G6 review

 

"Stupidity is like trying to find a limit of a constant. You are never truly smart in something, just less stupid."

Camera Gear: X-S10, 16-80 F4, 60D, 24-105 F4, 50mm F1.4, Helios44-m, 2 Cos-11D lavs

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author
1 minute ago, GDRRiley said:

No both would spin their max 

But you said "at the same speed". 1000 RPM fan cant go to 1500 RPM.

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
1 minute ago, SleepingGiant20 said:

But you said "at the same speed". 1000 RPM fan cant go to 1500 RPM.

That was assuming identical fans. If you only using 3 pin you’ve got voltage controlled speed so they never will be at the same speed. 

Good luck, Have fun, Build PC, and have a last gen console for use once a year. I should answer most of the time between 9 to 3 PST

NightHawk 3.0: R7 5700x @, B550A vision D, H105, 2x32gb Oloy 3600, Sapphire RX 6700XT  Nitro+, Corsair RM750X, 500 gb 850 evo, 2tb rocket and 5tb Toshiba x300, 2x 6TB WD Black W10 all in a 750D airflow.
GF PC: (nighthawk 2.0): R7 2700x, B450m vision D, 4x8gb Geli 2933, Strix GTX970, CX650M RGB, Obsidian 350D

Skunkworks: R5 3500U, 16gb, 500gb Adata XPG 6000 lite, Vega 8. HP probook G455R G6 Ubuntu 20. LTS

Condor (MC server): 6600K, z170m plus, 16gb corsair vengeance LPX, samsung 750 evo, EVGA BR 450.

Spirt  (NAS) ASUS Z9PR-D12, 2x E5 2620V2, 8x4gb, 24 3tb HDD. F80 800gb cache, trueNAS, 2x12disk raid Z3 stripped

PSU Tier List      Motherboard Tier List     SSD Tier List     How to get PC parts cheap    HP probook 445R G6 review

 

"Stupidity is like trying to find a limit of a constant. You are never truly smart in something, just less stupid."

Camera Gear: X-S10, 16-80 F4, 60D, 24-105 F4, 50mm F1.4, Helios44-m, 2 Cos-11D lavs

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
14 minutes ago, SleepingGiant20 said:

So, if I have two 3 pin fans, one can spin max at 1500 rpm and the other one at 1000 rpm, both are going to spin at 1000 rpm?

Your motherboard doesn't work with RPM, it works with %:

image.thumb.png.db849fbda633cad792c877162534487b.png

(This is just an illustrative example)

 

So if you set it up so they both run at 100%, they will run at 1500 and 1000RPM respectively. If you set them up at 50%, they will run at 750RPM and 500RPM.. etc.

It's just that they're both at the same %.

"We're all in this together, might as well be friends" Tom, Toonami.

 

mini eLiXiVy: my open source 65% mechanical PCB, a build log, PCB anatomy and discussing open source licenses: https://linustechtips.com/topic/1366493-elixivy-a-65-mechanical-keyboard-build-log-pcb-anatomy-and-how-i-open-sourced-this-project/

 

mini_cardboard: a 4% keyboard build log and how keyboards work: https://linustechtips.com/topic/1328547-mini_cardboard-a-4-keyboard-build-log-and-how-keyboards-work/

Link to comment
Share on other sites
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing Cooling

×