Adding 2 new fans with a limited number of fan connectors

[TaxxiDriver]

I'm thinking about installing more fans and I wanted to check what I'm going to do makes sense. So first of all, here are the specifications of my mobo:

 

CPU Fan Connector (CPU_FAN1) (currently occupied)

CPU/Water Pump Fan Connector (CPU_FAN2/WP)

Chassis/Water Pump Fan Connector (CHA_FAN1/WP)

Chassis/Water Pump Fan Connector (CHA_FAN2/WP) (currently occupied)
Chassis/Water Pump Fan Connector (CHA_FAN3/WP) (currently occupied)

 

The last 4 connectors can all detect whether the connected fan is 3-pin or 4-pin, all of them can be controlled by Smart Fan Speed Control and have (2A, 24W) maximum limitation. The exact specifications can be seen here.

 

Now I want to add 2 more fans, and the remaining headers are CPU_FAN2/WP and CHA_FAN1/WP. First of all, I'm not sure if I can just put 2 fans into those slots, in particular I'm not sure if I can put it in the CPU_FAN2 header. I think I can just put it there and make it target for the mobo temp in the UEFI but not so sure about it.

 

Also about fan splitters; the fans I've bought are Noctua NF-S12B. The product page says the max current is 0,075A, so this means I can use a splitter to connect two of them into a single header, right? In fact, if the information is correct, I should be able to connect something like 4 fans into 1 header without a problem... Also can I just connect one 3-pin and one 4-pin into a single splitter? I wonder how the UEFI will handle this.

 

I just wanted to be sure since this is my first time installing additional fans with my first build. Any helpful information would be appreciated!

[EsaT]

There's really no sense to have for example front intake fans doing same job running at different speeds.

(or if having two fans in CPU heatsink)

Unless being some super high speed noise makers at least two fans can be connected to pretty much any fan header.

So it's easiest to use splitter for connecting them in parallel to same output.

Though fans should be identical, or there's going to be speed disparity.

 

Also fans must be controllable same way.

PWM signal won't do any good with 3 pin fan.

Though voltage control should be available from pretty much any motherboard and works with most fans.

(except Corsair maglevs whose bearing malfunctions if fed lowered voltage)

[LogicalDrm]

Only one connector type per splitter. As you can set mobo to use either DC or PWM control, not both. If you use DC, all fans will work fine. If you use PWM, only PWM fans will work, DC fans will be at full speed.

 

You should be able to have 4 fans on single header just fine. All your fan headers are with full support, so if you have free headers, you can just go with them.

[TaxxiDriver]

Thank you guys! I'll grab some splitters as well this time.