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Gigabyte Z87X-UD5H PWM Fan control issues.

post #1 of 4
Thread Starter 
I have a Gigabyte Z87X-UD5H. I am upgrading form an Asus board.

I have 6 PWM fans 4 of one kind and 2 of another, 1 PWM pump and 2 standard 3 wire fans.

The issue that I am having is this:

Without having the 12v +/- attached to the motherboard the motherboard will not control the fans and pumps. They just run at 100% and the motherboard sees the RPM signal. If I plug the fan directly into the motherboard then it will control it but if I get the 12v from molex then it will not control it.

This is a big issue because:

The pump can only get it's 12v supply from molex.
The 4 identical fans need to scale to the CPU temperature and therefore need to be all on the same channel and that channel needs to be the secondary CPU fan channel with the PWM pump running off the primary CPU channel.
The 2 identical fans are server fans that run at 4000RPM and I do not think it would be wise to get the 12v from the board.

So what the heck do I do? This is kind of silly!!! It almost sounds as if this board isn't actually using PWM to scale the fans.

Does anyone have any insight to this issue?

With my ASUS boards all the board needs to see is PWM and RPM to properly control the fan. That way I can get the power from molex and not worry about if the board can handle 4 fans plugged into one fan header or 2 gigantic server fans that suck down as much power as 4 fans each.
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post #2 of 4
If I'm understanding you correctly, you would like to plug a fan into a molex connector and also then have the motherboard control the fan's speed? That is impossible. If the fan is plugged into a molex connector, it will run at 12V and there is nothing that can be done to make it go slower.

I also have a watercooling system hooked up to my z87z ud5h. I have the pump connected to CPU_FAN and it runs at max speed regardless of what I set the CPU_FAN control to in the bios. Regardless, no problem there because I want it to run at max. As for your 4 identical fans, just plug them into SYS_FAN1,2,3 and CPU_OPT and set them to scale as you wish in the bios (manual mode from the drop-down and then select the desired PWM/degree celcius). For the 4000 RPM server fans just plug those into SYS_FAN 4 and 5 and again select whatever behavior you want. Sys_fan 4 and 5 dont' have independent controls, both of them will scale together.
post #3 of 4
Thread Starter 
Quote:
Originally Posted by munim View Post

If I'm understanding you correctly, you would like to plug a fan into a molex connector and also then have the motherboard control the fan's speed? That is impossible. If the fan is plugged into a molex connector, it will run at 12V and there is nothing that can be done to make it go slower.

I also have a watercooling system hooked up to my z87z ud5h. I have the pump connected to CPU_FAN and it runs at max speed regardless of what I set the CPU_FAN control to in the bios. Regardless, no problem there because I want it to run at max. As for your 4 identical fans, just plug them into SYS_FAN1,2,3 and CPU_OPT and set them to scale as you wish in the bios (manual mode from the drop-down and then select the desired PWM/degree celcius). For the 4000 RPM server fans just plug those into SYS_FAN 4 and 5 and again select whatever behavior you want. Sys_fan 4 and 5 dont' have independent controls, both of them will scale together.

I think that you may be misunderstanding what PWM is. In PWM mode the 12v is left unchanged and therefor does not need to be supplied by the fan controller. The fan control is responsible for sending a pulsed signal to the fan which tells the fan to turn off and on very quickly in order to modulate its speed. The fan is always seeing 12v. These are the fans that have 4 wires not 3.

The pump has 4 wires as well which are 12+, 12-, PWM and RPM. The 12v is supplied by molex by default and then the PWM and RPM go to the board. The whole entire reason the manufacturer of the pump designed the pump that way is so that a motherboard that can control via PWM would be able to change the speed of the pump. Again not through the voltage but via the PWM signal.

I know it is not impossible because this is exactly how I did this on my last board.

If you have a pump that has PWM meaning 2 wires going to the motherboard and 2 wires going to 12v molex then you are being screwed over because you have no speed control. However you might just have a 3 wire pump and only 1 wire is going to the motherboard which just gives you RPM monitoring and honestly I could care less about that. I want my pump to last longer, run cooler, and be quieter when the system is idling.
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post #4 of 4
Oh I see! I thought you were just directly connecting a fan to molex.

Anyway, take a look at page 26 and 27 of the UD5H manual and you'll notice that not all fan headers have the same pin layout, maybe that's the problem and you have to switch up some of the wires on the fan / pump headers.
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