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Two Arctic system fans - 2 system fan headers = help please

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  • Arctic
  • Gigabyte
  • Fan
  • Motherboards
  • Components
Last response: in Components
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June 23, 2014 4:40:58 AM

Hello.

I have a Gigabyte h81m-ds2v motherboard with 2 sys-fan headers. I have bought an F8 pwm and an F8 Pro (PST) to keep things nice and cool. At present, I have the PSU sucking air up and out, (positioned just above the CPU fan), and a space for a system fan just to the left. My Radeon HD GPU is in the lower half of the case, and I wanted to ensure that was getting some fresh air to it so I could do some GPU over-clocking. My plan is to have the first fan as an intake - sucking air in the front-bottom (sending the GPU some air), and the second fan (which is not reversible) as an exhaust. Now I have the setup explained, I wanted to ask how best to plug these in. I would like the fans to be on very low speed for when I am just surfing the internet or doing other low demanding activites, and for things like video rendering and gaming, for the speed to be up high: I would like this to be automatic.

Apparently, the second fan has this "PST" function, but as far as I can work out, it only works if plugged into the CPU fan header. I am not happy about that, as that would mean the CPU fan is dependant on the system fans, and I don't want to be putting the CPU at risk.

How do I set up these fans? Using the Gigabyte Easytune Smart Fan software, seems to suggest that the system fans are only controlled by system temperature, and not CPU temperature.
Hopefully I have included enough information for a fool-proof answer :pt1cable: 

Cheers to all who can help

UPDATE: I installed both fans - the reversible one on the front, and the one-way pro fan on that back. However, while both fans spin, only the one plugged into "sys fan 1" is recognized by BIOS, Easytune or HWmonitor, therefore, I cannot control the speed for both. Shame, as that was the whole idea of this. Both sysfan headers are 4 pin. Is this is a faulty board, faulty fan, or lacking some sort of configuration?
Just had an idea: Could I plug the rear unrecognised fan into the CPU fan header, and then the CPU fan into the "PST" lead? Would it be safe?

More about : arctic system fans system fan headers

a b V Motherboard
June 23, 2014 8:44:12 AM

Dave Thompson said:

Just had an idea: Could I plug the rear unrecognised fan into the CPU fan header, and then the CPU fan into the "PST" lead? Would it be safe?

I think you could try that,just keep the case open and look if both fans spin.If not power down via the power on switch=hold it for a longer time.
You'll just have to see if or how the rear fan will be controlled that way.
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June 23, 2014 8:44:41 AM

uh i are both fans pwm?
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a b V Motherboard
June 23, 2014 8:49:46 AM

Xtwargodtx said:
uh i are both fans pwm?

Look,


Dave Thompson said:
H I have bought an F8 pwm and an F8 Pro (PST) to keep things nice and cool.


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June 23, 2014 8:55:20 AM

huh it might be possible that one of the fan heads are messed up have you tried putting the fan into the other fan head?
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June 23, 2014 9:29:10 AM

Thanks for the reply guys. Just had another idea :) 
Why couldn't the second fan be plugged into the sysfan1, so same method as using the CPU? I shoulda thought of that before. It seems mighty strange that the computer doesn't see the second fan, as there would be no point in having 2 sys-fan headers. I will check now, and plug the second fan into sysfan1 to see if it's a faulty fan or not. Stand by please.
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June 23, 2014 9:57:39 AM

yeah it would be working im thinking that system fan 2 might be faulty
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June 23, 2014 10:40:03 AM

Haa, my brain keeps freezing up!

To my shock and horror after switching on with the side cover off, I noticed that fan 2 at the back wasn't spinning!
I read this in the Amazon reviews, where someone mentioned that the fan frame warps as you tighten it, and the blades get stuck. Thinking this wouldn't happen to me, well it did. Thankfully, even though the pc had been on for at least an hour with that fan stuck, it still works. I will have to loosen it somehow.

Anyway. I plugged fan 2 into sysfan1 header, and the BIOS read it and Easytune was able to do it's calibration and the speed went from fast to slow. So, good, the fan is OK.

I only have 1 option left, and here it is....

If I plug fan2 into CPU fan header, and CPU fan into the daisychain socket leading from the fan, that will mean one system fan will be controlled by the CPU, and the other fan controlled by the system temperature. I would rather have them running in sync, so I tried plugging fan 2 into sysfan1 header, and fan 1 into the daisychain socket from the fan, and now both are being controlled by the system temperature and operating at same speed. Shame the sysfan2 header isn't working as it should though, but it seems not to be a problem now.
This will be my solution, so thanks very much for your replies.
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July 21, 2014 2:35:28 PM

Dave Thompson said:
Hello.

I have a Gigabyte h81m-ds2v motherboard with 2 sys-fan headers. I have bought an F8 pwm and an F8 Pro (PST) to keep things nice and cool. At present, I have the PSU sucking air up and out, (positioned just above the CPU fan), and a space for a system fan just to the left. My Radeon HD GPU is in the lower half of the case, and I wanted to ensure that was getting some fresh air to it so I could do some GPU over-clocking. My plan is to have the first fan as an intake - sucking air in the front-bottom (sending the GPU some air), and the second fan (which is not reversible) as an exhaust. Now I have the setup explained, I wanted to ask how best to plug these in. I would like the fans to be on very low speed for when I am just surfing the internet or doing other low demanding activites, and for things like video rendering and gaming, for the speed to be up high: I would like this to be automatic.

Apparently, the second fan has this "PST" function, but as far as I can work out, it only works if plugged into the CPU fan header. I am not happy about that, as that would mean the CPU fan is dependant on the system fans, and I don't want to be putting the CPU at risk.

How do I set up these fans? Using the Gigabyte Easytune Smart Fan software, seems to suggest that the system fans are only controlled by system temperature, and not CPU temperature.
Hopefully I have included enough information for a fool-proof answer :pt1cable: 

Cheers to all who can help

UPDATE: I installed both fans - the reversible one on the front, and the one-way pro fan on that back. However, while both fans spin, only the one plugged into "sys fan 1" is recognized by BIOS, Easytune or HWmonitor, therefore, I cannot control the speed for both. Shame, as that was the whole idea of this. Both sysfan headers are 4 pin. Is this is a faulty board, faulty fan, or lacking some sort of configuration?
Just had an idea: Could I plug the rear unrecognised fan into the CPU fan header, and then the CPU fan into the "PST" lead? Would it be safe?


Does your processor fan blow air toward the MB or away ?
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