Multiple fans on cpu header safe?

[GlaZe08]

Hello!

 

Just build my first pc and realised i did not have a fan splitter for my 3 fans on AiO but i do have a little fan hub built into my case which is powered by SATA ( Fractal design meshify 2 ) Which i plugged all 3 into it and then the hub into cpu header. 
 

What im worried about is that my 4 case fans are also plugged into that hub. Which means i have 7 fans connected to the cpu header. I read the mobo manual and made sure all fans were under the max power and stuff but i just wanted to double check if this is safe to do, or will cpu header burn out.

 

Only negative thing with this seems to be that all fans speeds are adjusted based on cpu temp

[Mister Woof]

Read the manual to see how many amps your CPU header supports. Usually it's .75 to 3. That will do for when you get the splitter.

For SATA, IIRC it is 4.5amps. 

 

Usually fans use up .25amps. So do the math.

[GlaZe08]

8 minutes ago, Mister Woof said:

Read the manual to see how many amps your CPU header supports. Usually it's .75 to 3. That will do for when you get the splitter.

For SATA, IIRC it is 4.5amps. 

 

Usually fans use up .25amps. So do the math.

Cpu header is 2A 24W 

 

Radiator fans 0.2 A * 3 = 0,6 1.32 W * 3 = 3,96 

3 rgb fans, 0.1A * 3 = 0,3 1.2 W * 3 = 3,6

1 stock fan,  doesnt say but prob same as others. So 0,9 A and 7,56W 

 

Also do you mean that the SATA pushes 4.5 amps into the cpu header???

[SorryBella]

7 minutes ago, GlaZe08 said:

Also do you mean that the SATA pushes 4.5 amps into the cpu header???

He means SATA power for example. afaik SATA and CPU usually sits on a different rail and it should not push that much amp to any of the board header.

[Mister Woof]

15 minutes ago, GlaZe08 said:

Cpu header is 2A 24W 

 

Radiator fans 0.2 A * 3 = 0,6 1.32 W * 3 = 3,96 

3 rgb fans, 0.1A * 3 = 0,3 1.2 W * 3 = 3,6

1 stock fan,  doesnt say but prob same as others. So 0,9 A and 7,56W 

 

Also do you mean that the SATA pushes 4.5 amps into the cpu header???

You said your fan hub is powered by SATA, right? 

 

Then that hub should be 4.5A, while the cpu header should be 2A.

 

If I'm reading this right, the hub plugs into your motherboard fan header so that it can get the pwm signal to know what speed to run the fans on the hub at based on the motherboard sensors, but the actual power is being drawn from the SATA cable.

 

If you have 7 on it, it would draw from the 4.5a of the SATA cable.

[GlaZe08]

4 minutes ago, Mister Woof said:

You said your fan hub is powered by SATA, right? 

 

Then that hub should be 4.5A, while the cpu header should be 2A.

 

What's currently plugged into your CPU fan header?

 

 

The fan hub and all fans

 

it says in the manual tho to connect hub to cpu or sys fan

[Mister Woof]

Just now, GlaZe08 said:

The fan hub and all fans

 

it says in the manual tho to connect hub to cpu or sys fan

Yeah, see my edits.

[GlaZe08]

2 minutes ago, Mister Woof said:

Yeah, see my edits.

ok ok so i should be fine then, nothing will die i hope

[GlaZe08]

35 minutes ago, Mister Woof said:

Yeah, see my edits.

In that case do i need to get a splitter or is it fine like this?

[Mister Woof]

6 hours ago, GlaZe08 said:

In that case do i need to get a splitter or is it fine like this?

It's probably fine - but running off different headers allows you more fine control over each set of fans since you can set the curve separately.

 

So if you want to the radiator fans to run at x curve because they're different rpm than the case fans, you can.

[GlaZe08]

On 4/24/2021 at 5:32 PM, Mister Woof said:

It's probably fine - but running off different headers allows you more fine control over each set of fans since you can set the curve separately.

 

So if you want to the radiator fans to run at x curve because they're different rpm than the case fans, you can.

Yeah i did order a Y splitter so i will plug radiator fans and case fans seperately