How do I turn off case fan with a fixed speed?

Which 3 pin connector?

then your motherboard does not support controlling the fan speed, it can not be done with out a fan controller
http://www.newegg.ca/Product/Product.aspx?Item=N82E16811991006&cm_re=fan_controller-_-11-991-006-_-Product

if that one doesn't work for you try this one
http://www.newegg.com/Product/Product.aspx?Item=N82E16811990008&cm_re=fan_controller-_-11-990-008-_-Product

no you would plug the fans directly in to the controller and you can set them manually.

Whats using SYS FAN 1 ?

3 pin versus 4 pin headers tells you beans

-CPU fans are just about always 4 pi PWM
-A 3 pin header is generally DC Voltage controlled.
-A 3 pin or 4 in header can be EITHER PWM or DC voltage controlled

From the manual it would appear....

The CPU fan speed can be controlled by either PWM or DC voltage selectable in the BIOS
The SYS_1 fan speed is controlled by PWM and controllable via the BIOS. This is what you should be using.

And to correct some misinformation.....

Your MoBo definitely has speed control... this fact is repeated multiple times in the manual..... However, you must use the appropriate connectors.

You can plug a 3 pin fan on a 4 pin connector.

You by no means need fan controller, I don't think you wanna be dialing knobs every time your load goes up and down anyway.

Option 1 - Use a fan splitter cable on the SYS-1 connector. I have had mixed experiences with these and you need to choose the type of splitter used.

Option 2 - Use a Phanteks Hub. This works flawlessly .... you plug the feeder cable (comes in the kit) into SYS_1 header and the other end to the hub input. The hub has 6 outputs:

1 - can connect 1 fan only
2 - can connect up to 2 fans with included splitter
3 - can connect up to 2 fans with included splitter
4 - can connect up to 2 fans but would need to but another splitter
5 - can connect up to 2 fans but would need to but another splitter
6 - can connect up to 2 fans but would need to but another splitter

So with the hub kit ....

-you can connect up to 6 fans with no splitters
-you can connect up to 8 fans with included splitters
-you can connect up to11 fans with 3 purchased splitters (@ $2each)

All fans will work off ya SYS_ header and be speed controlled according to the PWM slope curve you set up as described in the manual ... you should be OK with up to 6 fans connected w/o using the included power connector.

Phanteks Hub - $20
http://www.newegg.com/Product/Product.aspx?Item=N82E16811984004

That's cheaper than a fan controller and requires no knob turning / user attention after initial setup

SYS FAN 1 would be the fan connector (3 pin or 4 pin) that is attached to the mobo

"The speed control function requires the use of a fan with fan speed
control design."
Meaning a fan with a 4 pin connection and as he has stated his have 3 pins, the mother board does not support fan control on said fans.
Sorry if i was a little ambiguous but that doesn't change the fact that he cant control the fans.

The 4th pin is the control pin you will still not be able to control the fans

Pin1: ground
Pin2: 12v
Pin3: Sense
Pin4: Speed Controle (no 4th pin no controle)

1. He has both 3 and 4 pin headers. Again, please read the manual

http://download.gigabyte.us/FileList/Manual/mb_manual_ga-970a-ud3p_e.pdf

Page 23

First, look at the diagram for SYS_FAN1. It ***is** a 4 pin header. SYS_FAN2 is a 3 pin header.

Second, look at which wire is used how ... it clearly shows that fan control is via the pin no 2 and that pin no 4 is dead. If ya do a little research you will find that in PWM system that are commonly controlled you can NOT have have two fans sending back rpm signals.... that why if ya look at a PWM splittter, the 4th wire is cut or non existent.

Page 40

1st System Fan Speed Control (SYS_FAN1 Connector)Allows you to determine whether to enable the fan speed control function and adjust the fan speed.

Normal - Allows the fan to run at different speeds according to the system temperature. You can adjust the fan speed with EasyTune based on your system requirements.

Click to expand...

All he has to do is move the fan cable from SYS_FAN2 to SYS_FAN1 and problem solved. If SYS_FAN1 is already being used, the hub solves the problem.

I have read the manual, what you seem to be failing to grasp is that the fans he wants to plug in to the motherboard do not have the 4th pin they are only 3 pin fans not 4 pin fans, yes they can be plugged in to the motherboards 4 pin socket but the 4th pin will be out in the open and none functional...

I can not explain it any simpler

What you don't seem to grasp is the the Phanteks Hub is designed to do exactly that, run multiple 3 pin fans off a 4 pin header.

but this is what the fan has
Pin1: ground
Pin2: +12v / speed control
Pin3: Sense

they will run the speed will just be static

3-pin fans - the fan is controlled by voltage. I think that means fan speed is adjusted by some physical means, such as a knob to turn. It's not possible to adjust the fan speed through the motherboard (i.e. Speedfan, bios, other software won't have any affect on the speed fan).

4-pin fan - the fan is controlled by pulse-width modulation (pwm), which seems to mean you can adjust fan speed through the motherboard using software/bios.

Please read up on the Phanteks Hub

It has one 4 pin input and six 3-pin outputs.

http://www.newegg.com/Product/Product.aspx?Item=N82E16835709023

off three of these

http://www.newegg.com/Product/Product.aspx?Item=N82E16811984004&cm_re=pahnteks-_-11-984-004-_-Product

look carefully at the picture



Do you see the one 4 pin input and the six 3-pin outputs ? Do you see the labeling that the 4 pin connects to the PWM CPU fan ? Can we agree that 3 pin fans are 3 pin fans are 3 pin fans ?

Initial Build....

Ran 10 of those 3 pin fans as follows:

4 pin PWM CPU Header => Hub => five 3-pin case fans and five 3-pin radiator fans with 12 power cable providing enough juice to

Current Build

4 pin PWM CPU Header =>Pump No. 1
4 pin PWM CPU_1 Header =>Pump No. 2

4 pin DCV CHA_1 Header =>Hub_1 => six 3-pin radiator fans
4 pin DCV CHA_2 Header =>Hub_2 => four 3-pin radiator fans
4 pin DCV CHA_3 Header =>Hub_3 => five 3-pin radiator fans
No Power cable

What you say is not possible I have in fact been doing for over a year.

3-pin fans - the fan is controlled by voltage. I think that means fan speed is adjusted by some physical means, such as a knob to turn. It's not possible to adjust the fan speed through the motherboard (i.e. Speedfan, bios, other software won't have any affect on the speed fan).

Click to expand...

No.... while you are correct that the fan is controlled by voltage, there is no need for a knob, the MoBo simply sends a variable voltage signal.

Watch the video. it's on the Z77 platform .... there was no PWM CHA headers at this time. Today's Z97 MoBos for the most part all have 4 pin chassis headers which may be set to EITHER PWM or DCV control.

https://www.youtube.com/watch?v=4i-aTUMuIB0

Today Paul talks with J.J. from ASUS about their Fan Xpert 2 feature, which gives you precise control over your chassis fans when they're connected to your motherboard

Click to expand...

http://dlcdnet.asus.com/pub/ASUS/mb/LGA1150/MAXIMUS-VII-FORMULA/e9796_maximus_vii_formula_ug_v2_for_web_only.pdf

Please turn to page 3-45 of the manual where it clearly shows that any CH headr can be set to either PWM or DV voltage control.

awww, we have had a miss communication, i didn't see the first link so i had no idea you mentioned the hub :/ my bad.
You mistook me when i said his motherbord can't i meant with said fans.

i have never actually seen that hub before.

It's a wonderful thing ... turned the industry on it's ear.

PWM was great for getting fan speeds down to really low rpms ... very important in a water cooled system. However the downsides were:

-at low rpm ya oft get the annoying hum or ticking sound
-they cost twice as much
-Corsair PWMs don't like it when ya use lotta fans... speed control disappears.

Now with the hub, you get PWM control but it happens at the hub .... so no nasty clicking / hum sounds from the motor... you still get the very low speeds and you pay $8 for a fan instead of $20 - $30.

i have a corsaire d650, it has a small fan hub built in nice and unobtrusive, run it on low 99% of the time high noise is much greater than the reward.

I'm not sure I understand.... it makes lotta noise even on low ?


The hub shud be silent .... fans will make noise at above 850 rpm or so.....Im sitting about18" away from my case with the side panels off and I have to look over to see if the fans are spinning....

Idle, browsing, .... off
Light gaming 375 - 425 rpm
Furmark .... 850 tops