z77x-ud3h System Fans Query

[spluff]

Hi all,

I have 4 fans

2 NF-F12 PWM fans connected to sys1

1 NF-P14 volt fan connected to sys2

1 NF-P14 volt fan connected to sys3


The 2 PWMs seem to ramp up and down depending on the system temp.

The 2 voltage fans connected to sys 2 and sys 3 stay at a constant speed and dont change due to temp....

The manual says SYS_FAN1/2/3

1 GND
2 +12V/Speed Control
3 Sense
4 Reserve

Thanks


Can these fans be controlled via temperature?

[profJim]

Re: z77x-ud3h System Fans Query

Read page 47 in your mobo user manual:

CPU Fan Control mode
Auto Lets the BIOS automatically detect the type of CPU fan installed and sets the optimal CPU
fan control mode. (Default)
Voltage Sets Voltage mode for a 3-pin CPU fan.
PWM Sets PWM mode for a 4-pin CPU fan.

Note: The Voltage mode can be set for a 3-pin CPU fan or a 4-pin CPU fan. However, for a 4-pin CPU
fan that is not designed following Intel PWM fan specifications, selecting PWM mode may not effectively
reduce the fan speed.

CPU Fan Speed Control
Allows you to determine whether to enable the CPU fan speed control function and adjust the fan speed.
Normal Allows the CPU fan to run at different speeds according to the CPU temperature. You can
adjust the fan speed with EasyTune based on your system requirements. (Default)

Silent Allows the CPU fan to run at slow speeds.
Manual Allows you to control the CPU fan speed under the Slope PWM item.
Disabled Allows the CPU fan to run at full speeds.

Slope PWM
Allows you to control the CPU fan speed. This item is configurable only when CPU Fan Speed Control is
set to Manual. Options are: 0.75 PWM value /oC ~ 2.50 PWM value /oC.

1st/2nd/3rd System Fan Speed Control (SYS_FAN1, SYS_FAN2 and SYS_FAN3 Connectors)
Allows you to determine whether to enable the system fan speed control function for the system fans
connected to SYS_FAN1, SYS_FAN2 and SYS_FAN3 connectors and adjust the fan speed.

Normal Allows the system fan to run at different speeds according to the system temperature. You
can adjust the fan speed with EasyTune based on your system requirements. (Default)
Silent Allows the system fans to run at slow speeds.
Manual Allows you to control the system fans speed under the Slope PWM item.
Disabled Allows the system fans to run at full speeds.

Slope PWM
Allows you to control the system fan speed. This item is configurable only when 1st/2nd/3rd System Fan
Speed Control is set to Manual. Options are: 0.75 PWM value /oC ~ 2.50 PWM value /oC.

[boondocks]

Re: z77x-ud3h System Fans Query

I would just experiment and see which works better for you. I don't know how well the control works on that board, on the UD5H it's a little weird.
---------------------------
Pic for profJim cause he didn't like my nail polish colors:

[profJim]

Re: z77x-ud3h System Fans Query

But hot pink is so becoming on you.
The monkey vomit green numbers are much harder to read.

[boondocks]

Re: z77x-ud3h System Fans Query

Just ain't no pleasing you, is there? besides, what's wrong with monkey vomit???? I heard it's good for cleaning motherboards.

[profJim]

Re: z77x-ud3h System Fans Query

Naw, I just like to keep people guessing.
I didn't say that there was anything wrong with monkey vomit....different strokes for different folks.
You can keep your motherboard cleaning guru status, but one forum member isn't happy with his new mobo smell.

[spluff]

Re: z77x-ud3h System Fans Query

erm.... i did read the manual and i dont think it works :)

The PWM fans seem to speed up and slow down depending on the sys temp but the 2 other fans which are volts just run at a constant speed :/

Can you mix both pwm and volt fans on this board?

(NOTE: The CPU Volt fan - speeds up and slows down depending on cpu temp)

[profJim]

Re: z77x-ud3h System Fans Query

Sure it works....in a convoluted user hostile way.
You might need to connect your 3-pin fans to the Cpu_Fan header and select the Voltage option.

Hopefully both PWM fans will work when connected to the Sys_Fan headers where you select Normal.
You can also try Manual mode and a PWM Slope profile.

Being a control freak (anyone surprised?), I prefer using a manual fan controller to balance cooling vs noise depending on the room temperature and how hard I'm running my system.

Let us know how each of the above configurations works with your motherboard.

[spluff]

Re: z77x-ud3h System Fans Query

i cant connect any more fans to the cpu one as it has the 2 cpu fans connected to it already :/

The PWM fans currently work fine ramping up and down - altho they are usually at 0RPM as its that cool in there

[spluff]

Re: z77x-ud3h System Fans Query

oh thanks for your help btw

[profJim]

Re: z77x-ud3h System Fans Query

Aha!! You didn't mention any fans connected to the Cpu_Fan header.
The problem appears to be when you mix 4-pin PWM fans and 3-pin fans on the Sys_Fan headers, where the 3-pin fan speeds can't be varied.

You could try this:

Move your current Cpu_Fan wires to one of the Sys_Fan headers.
Note: You might find that each Sys_Fan header will give very different fan speeds when testing with the same fan.

Connect the 3-pin fans to the Cpu_Fan header where you select Voltage to control these fan speeds.

I think that I'm beginning to confuse myself.

Let us know how this approach works out.

You're welcome, glad to help out.

[homesizzle]

Re: z77x-ud3h System Fans Query

I can confirm only 2 fans get speed control. I have 2 3-pin fans connected (cpu fan and sys fan1 on the lower right side of board).

They get controlled.

Any other fans on the other headers just run full blast. Maybe there's some trick I don't know?

[boondocks]

Re: z77x-ud3h System Fans Query

According the pin diagrams in the manual, fans 1-3 should work identically. Fan 4 looks like it would get full voltage all the time.
YMMV.

[ea3ot]

Re: z77x-ud3h System Fans Query

I have mounted a new pc for a friend of my with this MB Z77x UD3H. I have only the CPU Fan connected to the MB. What I will like to know is the setting to have this fan running at max speed all the time ( its a 4 pins PWM). Thanks

[profJim]

Re: z77x-ud3h System Fans Query

From page 47 in the mobo user manual:

• CPU Fan Control mode

Auto Lets the BIOS automatically detect the type of CPU fan installed and sets the optimal CPU
fan control mode. (Default)
Voltage Sets Voltage mode for a 3-pin CPU fan.
PWM Sets PWM mode for a 4-pin CPU fan.
Note: The Voltage mode can be set for a 3-pin CPU fan or a 4-pin CPU fan. However, for a 4-pin CPU
fan that is not designed following Intel PWM fan specifications, selecting PWM mode may not effectively
reduce the fan speed.

• CPU Fan Speed Control

Allows you to determine whether to enable the CPU fan speed control function and adjust the fan speed.
Normal Allows the CPU fan to run at different speeds according to the CPU temperature. You can
adjust the fan speed with EasyTune based on your system requirements. (Default)
Silent Allows the CPU fan to run at slow speeds.
Manual Allows you to control the CPU fan speed under the Slope PWM item.
Disabled Allows the CPU fan to run at full speeds.

• Slope PWM

Allows you to control the CPU fan speed. This item is configurable only when CPU Fan Speed Control is
set to Manual. Options are: 0.75 PWM value /oC ~ 2.50 PWM value /oC.