fans on motherboard

Ian Jones

Ian Jones

Ian Jones

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Cambridge
Hi all

I have a z390 aorus master motherboard, and have 9 cooler master 120mm sickleflow fans. (3 pin)

I am using a antec 360mm aio cooler on the cpu, that has a power plug, and another that connects to a fan/pump header on the mb

I have 2x 3 way fan splitters, and 4x 2 way splitters that I can use if needed.

5 x fans are on the aio in a push/pull (front as air in case)
4 x fans as exit (3 top, 1 rear)

I would like the cpu/bios to control the fans with my own fan curve.

What would be the best way to connect them all up to the motherboard please?

many thanks
ian
 
You have five fans in Push-Pull on a six-fan radiator? Why the empty slot?

Assuming you want everything controlled at once, I think the easiest way would be to use a mini fan hub.
Three sets of 2 fans* on the 2-way splitters, going to the AIO.
One set of 3 on a 3-way, going to the top exit.
One fan alone going to the rear exit.

That's five channels, so you'll need a six-channel hub (because I don't know of any with only five). There will be a power connector, either SATA or Molex, and a connector lead to put on the CPU_Fan header on the motherboard. However, you should be able to put this on any other fan header (you have about 6 to choose from) and still control it through BIOS, leaving CPU_Header to control the AIO. I believe your board has a second 'CPU_Opt' header, which could be ideal.

If you find you want the exhausts controlled separately, just put those on another free fan header and set the BIOS accordingly.

However, the AIO may want its rad fans connected to it, rather than the motherboard. It will probably also insist on being connected to the CPU_Header, for its own speed control... but if not, to either of these, then that gives you more options.




*Buy a sixth fan to complete the set! :)
 
thank you ttaskmaster

there isnt room to fit a 6th fan on the 360 aio

is this the hub thing you are talking about please, as I have one of these also, but i cant remember if it allowed the fans to be controlled, but just turned onto max speed.

Phobya 81136 Connector for Cooling Fan


yes the motherboard has the cpu fan and the cpu_opt options.

I think there are 8 fan ports on the motherboard.


https://www.aorus.com/Z390-AORUS-MASTER-rev-10


thanks
ian
 
Hi I have modded my case and fitted a 6th fan to the aio rad.

The 6 fans on the aio are split into 2. 3x2 then connected to the fan hub.

3x top exit fan connect via splitter to hub

1x rear exhaust fitted to hub.

Hub then plugged into molex connecter for power and onto mother board to fan cpu.

But the fans run at full speed all the time.

When in bios even if I change the speed, they still run max speed.

Is there any way to change this?

If I pug each fan into the mother board and not through the splitter, I can change the speed.

Thanka
Iab
 
Ian Jones said:
is this the hub thing you are talking about please, as I have one of these also, but i cant remember if it allowed the fans to be controlled, but just turned onto max speed.
Click to expand...
Dunno if you posted a picture, as I can't always see them here at work, but looking up the model number yes that is indeed a fan hub. I have something similar out the back of my Phanteks case.

Ian Jones said:
I think there are 8 fan ports on the motherboard.
Click to expand...
There are. I already looked at your manual! :)

Ian Jones said:
Hi I have modded my case and fitted a 6th fan to the aio rad.
Click to expand...
Good job!
All six on the push-pull are the exact same model of fan, right?

Ian Jones said:
But the fans run at full speed all the time.
When in bios even if I change the speed, they still run max speed.
Click to expand...
This is going to be tricky as I can't see which BIOS you have, and because I'm no expert myself, but I'm guessing you have a nice flashy UEFI BIOS with a mouse cursor and all that?

Either way, you should have the option to change a few things:
1/. Check which header you're setting to control the fans, and make sure it's the same one you plugged the hub into. Probably best to use one of the CPU headers, but be sure it's the correct one.
2/. You're running 3-pin fans, which are voltage controlled, so make sure the fan control in the BIOS is not set to PWM (which is for 4-pin fans).
3/. There may be a few other settings, such as whether the fans are set to a fixed rpm, a profile, or temperature controlled (maybe following a fan curve that you can set).

Have a go with the first two to start with, and let us know how you get on.
Remember to save when you exit the BIOS.
 
thank you again ttaskmaster

I had a play before I read your reply.

I have it plugged in like this at the moment

3x top exhaust fans via 3 way splitter plugged into cpu_fan

2x front aio fans via splitter into fan 3
2x front aio fans via splitter into fan 4
2x front aio fans via splitter into fan 5

1x rear exhaust fan into fan 2

they all work fine via bios and can control the speed.

yes the bios i can use my mouse with a cursor.

would it be ok to run them like this, or is it best to use the fan hub?

many thanks again
ian
 
It's OK to run them like that, yes.
Only reason I suggested the hub is because that's an easy and simple way to have all the fans at the same speed, and all controlled by the CPU header. Doing it like this off the board allows you to run different fan sets at different speeds.

One thing I would suggest is perhaps consider getting the AIO fans all connected to one of the CPU headers, though, and putting the others onto whichever headers are closest to them. My reasoning is that the AIO is cooling the CPU, so you'd want the AIO fans tied directly to the CPU temp. Different boards do things differently, but I suspect that's how it'd work best...

Note: You might find you need to use the hub just for these, as the header may not have enough power to supply six fans!


Which header is the AIO connected to?
I assume it needs one, so it can control the pump speed.....?
 
Last edited:
the aio pump has 2 plugs on it, one is a molex and the other is connected to sys fan 6_Pump, and that runs at 3000+ rpm from what it says in bios
 
Ian Jones said:
the aio pump has 2 plugs on it, one is a molex and the other is connected to sys fan 6_Pump, and that runs at 3000+ rpm from what it says in bios
Click to expand...
OK, try putting the AIO on the CPU_Fan and the AIO fans to CPU_Opt. You'll likely find that allows the AIO to alter speed according to temperature and will give you a much quieter experience! :)
 
thank you, ill try that tomorrow

at the mo, the cpu and gpu temps are 31 deg c when looking at this page, and the fan says it is doing around 620 ish rpm for cpu and 960 rpm for gpu. that is from CAM monitor
 
room temp is around 21 deg c

normally when playing pubg, gpu load at 99% the gpu is 60 degc a cpu around 50 deg c. that was with the 5 fans on the aio
 
Yep, sounds good to me. 8-10ºC above ambient is generally considered a good result!
It's better than mine, actually, but my rad is way too thick and I'm not running in Push-Pull. I need to go shopping...

Do play around with that AIO connector, though. I'm not sure you're doing the pump any longevity favours by running it at absolute full pelt all the time! ;)
 
I just tried the aio in the cpu_fan, but it made no difference to the speed.

tried to change it to slow/normal/max etc, but stayed the same, where the other fans changed.

oIYTafC.jpg
 
Is the CPU_Fan set to PWM or DC control, perhaps? Maybe Manual, Auto or Fixed RPM mode?
I don't know your BIOS so I can't advise as well as I'd like. However, you can get the System Information Viewer from Gigabyte, which incorporates Smart Fan 5 and runs in Windows so you don't have to mess around in BIOS.
It actually looks like some pretty good software and seems you can change all these things on the fly.

Worth considering - https://www.aorus.com/blog-detail.php?i=208
 
in the cpu_fan you can only have it set to cpu from what i can see. any of the other 4 pin fan headers, you can change the control, cpu, system, pwm etc

I cant seam to find where to down load the system information viewer from? did you have a link please
 
Ian Jones said:
in the cpu_fan you can only have it set to cpu from what i can see. any of the other 4 pin fan headers, you can change the control, cpu, system, pwm etc
Click to expand...
You should be able to change the Fan Control Mode.

On Mnitor, select CPU_Fan (or something similar) and then lower down should be the option to set Fan Control Mode to Voltage, or DC. Again, not precise terms, as I'm not fully familiar with your BIOS and motherboard. I'm an Asus user.

smartfan5-4.jpg


I cant seam to find where to down load the system information viewer from? did you have a link please[/QUOTE]
https://www.aorus.com/Z390-AORUS-MASTER-rev-10#pd_download
On that page, under Download, select Utility and scroll down to find both 'APP Center' and 'System Information Viewer/Smart Fan 5'
 
it looks like the aio pump speed is fixed at that 3k+ rpm, I downloaded the siv and the info on there said it is fixed. controllable range 100-100%
 
Ian Jones said:
it looks like the aio pump speed is fixed at that 3k+ rpm, I downloaded the siv and the info on there said it is fixed. controllable range 100-100%
Click to expand...
Hmm... which model is this? I know it's an Antec 360mm, but none of their current 360 models have fan headers.
Are you sure it's a fan connector and not an RGB one?
I find it very odd that it would have a header plug, but not have controllable pump speed.... Try setting just that one header to control mode PWM.
 
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