MSI Z87 fan control, Noctua d14 too loud

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ulukaj

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Sep 15, 2013
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Heres my story.

I just upgraded from old mobo with phenom ii x4 with noctua d14 to mobo MSI Z87 and i5 4670k. Problem is the noctua is too loud. Whereas in phenom system the fans went on 800-900 rpm, now they work on max even in idle! which means around 1300 rpm which is just too loud.

Problem is the MSI BIOS says the CPU temperature is 40 degrees (eg. from computer start up) but Real Temp app says just 27 - 30 degrees.

Is there any way how to talk reason into MSI BIOS and override the fan speed? (I tried to set fan speed in Bios hardware control with no satisfactory result, all stays the same:(

Thank you for help.
 
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photonboy

photonboy

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Jun 20, 2006
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The fan on that cooler is VOLTAGE-controlled not PWM so you likely can't control it. Your CPU_FAN likely only controls PWM fans.

I did a workaround by using my case fan outputs. They support BOTH PWM and Voltage. The temperature sensor was in the wrong spot obviously but it works well enough.

I also used a fan splitter to use a single case fan connection on the motherboard. My case fans were PWM so I actually used the CPU_FAN for the case fan near the CPU so it spins according to the CPU temperature.

If your case fan controllers don't work then you need a new cooler or different fans. Problem is replacing the fans costs as much as a half decent cooler ($25 or so each).

Cheers.
 
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ulukaj

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Sep 15, 2013
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But anyway I dont understand why the previous system never run the cooler on max rpm.. Is it just because of voltage? It is really annoying, because the system is now too loud in idle..
 
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babernet_1

babernet_1

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May 8, 2012
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Just see what the CPU temp is under heavy useage, under 80 deg is good.
 
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photonboy

photonboy

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Jun 20, 2006
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Points:

1. Using SYS_FAN, have you tried changing the fan profile in your fan control software that you get from the motherboard support site?

2. The reason the fan didn't spin at its highest speed is because it's Voltage and the controller is PWM. Not only don't you have fan control, but you won't reach the highest speed the fan supports.

*I don't see what SOLUTION you are using for fan control. I'm also not 100% certain that your CPU_FAN supports only PWM. You should be using the MSI software to control your fans, and you MIGHT have to enable fan control in the BIOS.
 
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babernet_1

babernet_1

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May 8, 2012
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His Nocuta cooler fans are not PWM.
 
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photonboy

photonboy

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Jun 20, 2006
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Did you even read what I said above?
"The reason the fan didn't spin at its highest speed is because it's Voltage and the controller is PWM."

I also said it in my first response. Please read more carefully.
 
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ulukaj

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Sep 15, 2013
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After few days my solution stays the same - the noctua d14 fans are plugged into SYS_FAN3 via Y reduction.

There I actually CAN control their speed in MSI Bios (for some reason I can control the fan speed on SY_FAN but not CPU_FAN) In the end the Noctua is perfectly silent (800 rpm) and I set that in the case of CPU temperature rises up to 60 deg, then fan should speed up to something around 1100 rpm which should be enough.

The really annoying thing was that the fans were running at max speed while plugged into CPU_FAN.
 
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photonboy

photonboy

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Jun 20, 2006
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The reason your CPU fans were at 100% in the CPU_FAN controller was likely the reason I stated a few times; the CPU_FAN controller probably only controls PWM fans. The NH-D14 fans are controlled by Voltage, not PWM.

The case fan controllers (including SYS_FAN) obviously support VOLTAGE (possibly both PWM and Voltage) for controlling fan speed.
 
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