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How to downvolt pump?

Go to solution Solved by Necrodead,

GPU temps are good, but CPU temp depends on what cpu you are using and what reading you are taking. There are 2 different readings in HW monitor, and only 1 is the actual temp of the die.

 

As for lowering your pump speed you'll have to either make, or buy, a molex (assuming that its a molex 4 pin you have on there) to a 3 pin fan header, and then you can run that off of either your motherboard, or a fan controller for even more control. Personally I would stick to a controller like an NZXT sentry, since the power draw on the pump may be too much for your motherboard.

Hi guys,

 

Recently I've updated my rig to a full watercooled loop (click hyperlink to see a picture I took of it).

Iìve got a EK DCP 2.2, thinking it was a good deal for performance/silence ratio of a short loop.

Still, at 12V the pump makes an annoying humming and I was wondering if downvolting can be recommended and which ways is possible to do it.

 

Also, I'd like your opinion guys abut my loop temps, cpu idles at 40-45°C and gets up to 69°C under stress testing while gpu never cross 60°C. Do you think it is acceptable?

 

Thanks!

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GPU temps are good, but CPU temp depends on what cpu you are using and what reading you are taking. There are 2 different readings in HW monitor, and only 1 is the actual temp of the die.

 

As for lowering your pump speed you'll have to either make, or buy, a molex (assuming that its a molex 4 pin you have on there) to a 3 pin fan header, and then you can run that off of either your motherboard, or a fan controller for even more control. Personally I would stick to a controller like an NZXT sentry, since the power draw on the pump may be too much for your motherboard.

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GPU temps are good, but CPU temp depends on what cpu you are using and what reading you are taking. There are 2 different readings in HW monitor, and only 1 is the actual temp of the die.

 

As for lowering your pump speed you'll have to either make, or buy, a molex (assuming that its a molex 4 pin you have on there) to a 3 pin fan header, and then you can run that off of either your motherboard, or a fan controller for even more control. Personally I would stick to a controller like an NZXT sentry, since the power draw on the pump may be too much for your motherboard.

 

That is actually a very good answer, thanks, and right now I'm with a Prodigy micro atx case. Unfortunately I don't have space for a drive bay fan controller because the dual radiator is on the way!

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That is actually a very good answer, thanks, and right now I'm with a Prodigy micro atx case. Unfortunately I don't have space for a drive bay fan controller because the dual radiator is on the way!

You could run it off your motherboard, just check what the wattage is supplied by the fan headers on there. I also believe you can get a smaller fan controller, like i've seen some thats just a knob on a wire, but space is premium in there so good luck!

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You could run it off your motherboard, just check what the wattage is supplied by the fan headers on there. I also believe you can get a smaller fan controller, like i've seen some thats just a knob on a wire, but space is premium in there so good luck!

 

Thanks man!

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Thanks man!

the ek 2.2 dcp has a 3pin fan connector on it when you remove the adapter. Its only a 8watt pump so a mobo fan header (not cpu_fan or cpu_opt cause its pwm) and speedfan or the mobos fan control can be used to lower the speed.
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the ek 2.2 dcp has a 3pin fan connector on it when you remove the adapter. Its only a 8watt pump so a mobo fan header (not cpu_fan or cpu_opt cause its pwm) and speedfan or the mobos fan control can be used to lower the speed.

 

True, the pump was connected through a molex but there is also a 3 pin. I just connected it to cpu_opt, installed speedfan and here you can see the readings:

 

35e8Olc.jpg

 

Where am I supposed to change fan speeds? I tried to change the percentages but nothing happens.

Thanks for the help by the way.

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True, the pump was connected through a molex but there is also a 3 pin. I just connected it to cpu_opt, installed speedfan and here you can see the readings:

35e8Olc.jpg

Where am I supposed to change fan speeds? I tried to change the percentages but nothing happens.

Thanks for the help by the way.

 You'll probably have to go into your bios and adjust the fan speeds manually from there. There are other programs that may work better than speedfan but I prefer the bios options. Just go poke around in there and you should find an option to change the fan speeds on most if not all of your fan headers.

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 You'll probably have to go into your bios and adjust the fan speeds manually from there. There are other programs that may work better than speedfan but I prefer the bios options. Just go poke around in there and you should find an option to change the fan speeds on most if not all of your fan headers.

 

I went to the bios and it is not possible to control the speed of the pump. Also with other programs, the speed is shown but not adjustable. So I read the pump manual and there is no indication that the 3 pin connector is a PWM one. The yellow wire is marked as "sensor" (square wave signal).

 

My idea is that it is not possible to control speed pump (just for this model) unless you use an external hardware solution like you told me in one of your previous posts.

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I went to the bios and it is not possible to control the speed of the pump. Also with other programs, the speed is shown but not adjustable. So I read the pump manual and there is no indication that the 3 pin connector is a PWM one. The yellow wire is marked as "sensor" (square wave signal).

My idea is that it is not possible to control speed pump (just for this model) unless you use an external hardware solution like you told me in one of your previous posts.

you have to connect to the mobo only and remove the molex adapter. That pump is not pwm.
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you have to connect to the mobo only and remove the molex adapter. That pump is not pwm.

 

that is what I did, when I connected the pump to the motherboard I completely removed the molex and left only the 3 pin.

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that is what I did, when I connected the pump to the motherboard I completely removed the molex and left only the 3 pin.

what is your mobo?
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You can control the fan speed with a 3 pin, its just the voltage that is changed rather than the PWM signal (the 4th wire). Your motherboard may not allow you to control that specific aux header, have you tried to control the CPU fan header? Contrary to what @Wirerat said, 3 pin and 4 pin fan headers can be used interchangably, you just don't get a PWM signal with a 3 pin. Check your bios to see if you can use one of the CPU fan slots. I know on my ASUS board(s) that you have to set how you'd like to control your fan/pump, PWM or voltage control, and you can only control the CPU fan slots. So try to set it to voltage control if you can, on whatever header works.

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You can control the fan speed with a 3 pin, its just the voltage that is changed rather than the PWM signal (the 4th wire). Your motherboard may not allow you to control that specific aux header, have you tried to control the CPU fan header? Contrary to what @Wirerat said, 3 pin and 4 pin fan headers can be used interchangably, you just don't get a PWM signal with a 3 pin. Check your bios to see if you can use one of the CPU fan slots. I know on my ASUS board(s) that you have to set how you'd like to control your fan/pump, PWM or voltage control, and you can only control the CPU fan slots. So try to set it to voltage control if you can, on whatever header works.

 

Oh, now I understand, thanks for the clarification. I'll check the bios asap and be back to you. Thanks!

 

 

what is your mobo?

 

It is an Asus Maximus IV Gene-Z

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You can control the fan speed with a 3 pin, its just the voltage that is changed rather than the PWM signal (the 4th wire). Your motherboard may not allow you to control that specific aux header, have you tried to control the CPU fan header? Contrary to what @Wirerat said, 3 pin and 4 pin fan headers can be used interchangably, you just don't get a PWM signal with a 3 pin. Check your bios to see if you can use one of the CPU fan slots. I know on my ASUS board(s) that you have to set how you'd like to control your fan/pump, PWM or voltage control, and you can only control the CPU fan slots. So try to set it to voltage control if you can, on whatever header works.

never said otherwise but if you connect a 3pin fan connector to a pwm fan plug like cpu_fan you have to switch it to voltage control in bios.

On Asus motherboard that means set fan to advanced in bios for non pwm control.

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never said otherwise but if you connect a 3pin fan connector to a pwm fan plug like cpu_fan you have to switch it to voltage control in bios.

On Asus motherboard that means set fan to advanced in bios for non pwm control.

I guess you were trying to keep it simple, but

(not cpu_fan or cpu_opt cause its pwm)

 

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I guess you were trying to keep it simple, but

yea why give him a bunch of extra steps when he has other fan plugs to use?

He will need some kind of fan at the cpu fan header or a stupid error will happen at boot. I just figured directed him away from those was the easiest way.

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I connected the pump to the CPU_FAN instead of CPU_OPT. When I run the pc, the bios tells me that cpu_fan rpm are zero and doesn't let me go further except going back to bios settings. Anyway I can hear the pump going normally full speed. I tried to search in the bios menus a way to set the cpu header voltage but i cannot figure it out.

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I will look in my Bios options when I get home, but until then have you checked for CPU smart fan mode under hardware monitor or H/W monitor in the bios?

"CPU Smart Fan Mode: If you enable CPU Smart Fan Control, you can then set the mode to Auto (controlled by the BIOS), Voltage (for use with 3-pin fans), or PWM (for use with 4-pin fans)."

 

This was just fram a generic bios guide, but I do recall seeing something similar on my own Asus board. I don't know what the problem with your CPU_FAN is, but maybe you can find that setting for your CPU_OPT, or even CHA_FAN1 (chassis fan).

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I will look in my Bios options when I get home, but until then have you checked for CPU smart fan mode under hardware monitor or H/W monitor in the bios?

This was just fram a generic bios guide, but I do recall seeing something similar on my own Asus board. I don't know what the problem with your CPU_FAN is, but maybe you can find that setting for your CPU_OPT, or even CHA_FAN1 (chassis fan).

 

I went back to bios looking for "CPU Smart Fan Mode" or something similar that allows me to voltage control the fan headers and I cannot find it. Here what I have:

idqdj5Q.jpg

 

And here is what i see If I open the sub menus:

7FWEy98.jpg

 

VyyxLKp.jpg

 

SFSzr4l.jpg

 

I'm starting to believe that this board might be too old or simply do not have that option, maybe?

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Reading online looks like other people have my same issue. Apparently this model doesn't have the option to set the headers with voltage control. At this point the only way is with a fan controller.

Thanks guys for the help, I've learned a lot! =)

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