[SOLVED] Adding fans to ASRock Fatal1ty B450 with splitters

Jan 31, 2020
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For my ITX build I've got a Fractal Design 202 case with an ASRock Fatal1ty B450 mobo attached. I've had the build done for awhile but ran into issues with overheating. I noticed the mobo has a header for the CPU fan, and another that says AMD fan LED header. There are also two for chassis/water pump fan connector.

Mobo manual here: http://asrock.pc.cdn.bitgravity.com/Manual/Fatal1ty B450 Gaming-ITXac.pdf

I bought two of each of these fans:
https://smile.amazon.com/gp/product/B07CG2PGY6/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

to put in the case, as seen in this reddit post:
https://www.reddit.com/r/sffpc/comments/97tjkw View: https://www.reddit.com/r/sffpc/comments/97tjkw/yanb_node_202_with_ryzen_5_2600x_and_gtx1060_took/


I'm installing the two small fans in the CPU area first and I'm having trouble figuring out which header to connect them to, and whether to leave the CPU fan plugged in by itself. Each fan comes with its own Y splitter. The OP of the reddit thread gave me this info:
For CPU fans:

Fan1+Fan2=Splitter1

Splitter1+Fan3 = Splitter2 > motherboard

For GPU fans:

Fan1+Fan2=Splitter3>4 pin Extension> motherboard

But I can't make heads or tails of that, and didn't want to keep pestering him.
 
Two fans can normally be run with a splitter and not exceed motherboard specs.
Your fans are 4 pin pwm fans which are going to need a pwm splitter like this:
https://www.newegg.com/p/N82E16812162059
I think the noctua fans are sufficiently low in power requirements so you can use splitters as you wish.
The motherboard pwm controls will set the speeds of all the fans connected to a given splitter to the same speed.
I might use one for the 120mm fans and a different one for the 80mm fans.
 
Two fans can normally be run with a splitter and not exceed motherboard specs.
Your fans are 4 pin pwm fans which are going to need a pwm splitter like this:
https://www.newegg.com/p/N82E16812162059
I think the noctua fans are sufficiently low in power requirements so you can use splitters as you wish.
The motherboard pwm controls will set the speeds of all the fans connected to a given splitter to the same speed.
I might use one for the 120mm fans and a different one for the 80mm fans.
 
Jan 31, 2020
4
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10
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Two fans can normally be run with a splitter and not exceed motherboard specs.
Your fans are 4 pin pwm fans which are going to need a pwm splitter like this:
https://www.newegg.com/p/N82E16812162059
I think the noctua fans are sufficiently low in power requirements so you can use splitters as you wish.
The motherboard pwm controls will set the speeds of all the fans connected to a given splitter to the same speed.
I might use one for the 120mm fans and a different one for the 80mm fans.
Right now I have all three fans (the two tiny ones and the CPU fan) hooked into the CPU FAN header via two Y-splitters and they all seem to be working. I ordered a 1-3 PWM splitter for the two larger fans. Is there a different config I should use for the three fans in the CPU compartment of my case?
 
Right now I have all three fans (the two tiny ones and the CPU fan) hooked into the CPU FAN header via two Y-splitters and they all seem to be working. I ordered a 1-3 PWM splitter for the two larger fans. Is there a different config I should use for the three fans in the CPU compartment of my case?
I think your plan is good.
The logic is that fans speed control for the cpu area is one logical control point and the fans for the gpu area is a different one.
 
Jan 31, 2020
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I think your plan is good.
The logic is that fans speed control for the cpu area is one logical control point and the fans for the gpu area is a different one.
Sorry for being a little dense, I'm still a bit new at all this, but if I understand you correctly, as long as all of the CPU fans are grouped into the same splitters/header, and as long as the GPU fans are grouped on the same splitter and header, then they should control properly for their given task?
 
Each motherboard header will control the speed of all the fans connected to the header in the same way.
I would have the cpu fan plugged into the cpu header all by itself so that the motherboard can actively control that.
As I read it, you have two added motherboard headers.
I would control the 80mm fans with one. 80mm fans need to run at high rpm to do any good.
The 120mm fans can run off the other header.
 

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