Question about pump fan header

[zexas_shehab]

my pump fan header gives 3A with 12V
i want to connect 3 fans with splitter
each fan is 0.5A but 14V (mobo header is 12V )
will there be any problems ?

 

[Lutfij]

Happy New Year!

Make and model of your motherboard? Also, please pass on a link to the fans you're working with, in case you might've missed any info.

 

[zexas_shehab]

Happy New Year!

Make and model of your motherboard? Also, please pass on a link to the fans you're working with, in case you might've missed any info.

happy new year ❤️
thanks for the fast response ^^
my motherboard is: MSI Pro b660m-A
the fans are : Corsair LL120 RGB

 

[Lutfij]

https://www.corsair.com/us/en/Categories/Products/Fans/ml-config/p/CO-9050072-WW#tab-tech-specs

13.2v is the maximum operating voltage, not 14v. Also, if you own 3 fans, I'm assuming you picked up the 3 fan pack...? If so, you're good to go, just follow the manual for your fans. If you don't own the 3 fan pack, then look into a PWM fan splitter that's got additional power input, like this one;

Gelid 1-to-4 PWM Fan Splitter - Shiny Hardware

Gelid’s 1-to-4 PWM Fan Splitter allows the user to connect up to four PWM fans from just one PWM fan header on the motherboard. And because the fans are PWM the RPM of each fan will change dependent on the temperature of the CPU and/or motherboard BIOS settings, meaning the RPM and therefore...

www.shinyhardware.co.uk

or this;
https://akasa.co.uk/update.php?tpl=product/product.detail.tpl&type=FANS ACCESSORIES&type_sub=Fan Cables&model=AK-CBFA03-45
or this;
https://www.xs-pc.com/hubs-/-controllers/8-way-pwm-splitter-hub-sata-powered
^ to make sure your PWM is taken care of. Though please keep in mind that you're going to need that lighting node hub/puck what ever Corsair calls it these days if you want to take advantage of the lighting effects on the fans.

 

[zexas_shehab]

https://www.corsair.com/us/en/Categories/Products/Fans/ml-config/p/CO-9050072-WW#tab-tech-specs

13.2v is the maximum operating voltage, not 14v. Also, if you own 3 fans, I'm assuming you picked up the 3 fan pack...? If so, you're good to go, just follow the manual for your fans. If you don't own the 3 fan pack, then look into a PWM fan splitter that's got additional power input, like this one;

Gelid 1-to-4 PWM Fan Splitter - Shiny Hardware

Gelid’s 1-to-4 PWM Fan Splitter allows the user to connect up to four PWM fans from just one PWM fan header on the motherboard. And because the fans are PWM the RPM of each fan will change dependent on the temperature of the CPU and/or motherboard BIOS settings, meaning the RPM and therefore...

www.shinyhardware.co.uk

or this;
https://akasa.co.uk/update.php?tpl=product/product.detail.tpl&type=FANS ACCESSORIES&type_sub=Fan Cables&model=AK-CBFA03-45
or this;
https://www.xs-pc.com/hubs-/-controllers/8-way-pwm-splitter-hub-sata-powered
^ to make sure your PWM is taken care of. Though please keep in mind that you're going to need that lighting node hub/puck what ever Corsair calls it these days if you want to take advantage of the lighting effects on the fans.

the splitter that i have right now is deepcool fh-04 its not sata powered , will there be any problems to use it ?

 

[Lutfij]

You should be fine.

 

[Paperdoc]

The specs for those fans say they use power at UP TO 13.2 V DC, so the 12 VDC supply is fine. They also say the max current per fan is 0.30 A, not 0.5 A. So three of these together top out at 0.90 A, less than the header can supply, and less than the normal limit of that DeepCool Splitter you have, which is 1.0 A. So you have no problems doing this.

 

[zexas_shehab]

The specs for those fans say they use power at UP TO 13.2 V DC, so the 12 VDC supply is fine. They also say the max current per fan is 0.30 A, not 0.5 A. So three of these together top out at 0.90 A, less than the header can supply, and less than the normal limit of that DeepCool Splitter you have, which is 1.0 A. So you have no problems doing this.

i connected the splitter to 3A header and put 4 fans on it .. is there any problems doing that ? i mean u said the deepcool splitter takes 1A so by connecting 4 fans each 0.3 the total is 1.2 A besides as far as i know pmw header gives a constant current but the forth pin gives the signal right ? thats means the splitter is getting a constant of 3 A is thats dangerous ? can it melt or something ?

 

[Paperdoc]

You misunderstand the signals from a PWM header. In that signal system, the power supply is Ground on Pin #1, and +12 VDC constant VOLTAGE on P{in #2. The PWM signal is sent on Pin #4. Inside the fan a chip uses that signal to modify the flow of CURRENT from the 12 VDC supply line through the windings to achieve speed control. So IF the PWM signal calls for max speed, each fan will then draw its max AMPS rating of current from that 12 VDC supply. When you use a SPLITTER to connect several fans to one header, the AMPS current drawn by each fan (IF they are the SAME fan model) is the same, so total AMPS is max for one times number of fans.

In your case with FOUR fans plugged into the DeepCool Splitter there MIGHT be a problem, but likely not. Why? Well, the specs for those fans say max current is 0.30 A per fan. 4 x 0.30 = 1.20 A, and that may exceed the Splitter's ability. BUT there is a big unknown here. The spec does NOT say that amp rating is for the MOTOR only! It is a LIGHTED fan with ARGB lights in its frame, and the lights themselves draw current BUT from a different supply through a separate cable from a different mobo header. The specs do not say anything about the max current for the lights only. So the max current spec published MAY be the total for BOTH motor and lights, and the motor is less than that. Those specs simply to NOT tell us this detail. It is common that fan MOTORS of this size and type draw a max current of 0.10 to 0.25 A per motor, LESS that the 0.30 A in the published spec. So, what IS the REAL motor max current draw? We do not know.

 

[zexas_shehab]

You misunderstand the signals from a PWM header. In that signal system, the power supply is Ground on Pin #1, and +12 VDC constant VOLTAGE on P{in #2. The PWM signal is sent on Pin #4. Inside the fan a chip uses that signal to modify the flow of CURRENT from the 12 VDC supply line through the windings to achieve speed control. So IF the PWM signal calls for max speed, each fan will then draw its max AMPS rating of current from that 12 VDC supply. When you use a SPLITTER to connect several fans to one header, the AMPS current drawn by each fan (IF they are the SAME fan model) is the same, so total AMPS is max for one times number of fans.

In your case with FOUR fans plugged into the DeepCool Splitter there MIGHT be a problem, but likely not. Why? Well, the specs for those fans say max current is 0.30 A per fan. 4 x 0.30 = 1.20 A, and that may exceed the Splitter's ability. BUT there is a big unknown here. The spec does NOT say that amp rating is for the MOTOR only! It is a LIGHTED fan with ARGB lights in its frame, and the lights themselves draw current BUT from a different supply through a separate cable from a different mobo header. The specs do not say anything about the max current for the lights only. So the max current spec published MAY be the total for BOTH motor and lights, and the motor is less than that. Those specs simply to NOT tell us this detail. It is common that fan MOTORS of this size and type draw a max current of 0.10 to 0.25 A per motor, LESS that the 0.30 A in the published spec. So, what IS the REAL motor max current draw? We do not know.

thanks alot for the detailed answer!!