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Noctua NF-F12 120mm fans wont go over 800rpm?

post #1 of 8
Thread Starter 
I recently got some Noctua NF-F12 fans to run on a Corsair H105
and they wont go over 800rpm but have a max ability of 1500rpm?
I am not using the included low noise adapters which might make it even worse
but I am using the included y-splitter and running both fans off
the CPU header on my motherboard (Asus board).
I have went into the BIOS and changed the fans from standard to turbo and still nothing
even under full load on prime95 what could it be?
Temps will get hot and still the fans never kick up.
post #2 of 8
what mobo and psu do you have? and have you tried run only 1 fan without the splitter to see if you reach 1500rpm?
post #3 of 8
Try to set the CPU Q-Fan control to disabled then check the fan speed.
The fan should run at max speed.

Are you using the cpu at stock settings?
I think it's possible that the system not needing to ramp up the fan speed to keep the cpu under safe temps.
Edited by edsai - 5/15/14 at 6:37am
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post #4 of 8
Thread Starter 
Quote:
Originally Posted by narrdarr View Post

what mobo and psu do you have? and have you tried run only 1 fan without the splitter to see if you reach 1500rpm?

The motherboard I am using is a ASUS MAXIMUS VI IMPACT LGA 1150 Intel Z87
its a mini-ITX board and my power supply is a Corsair AX760.
I am going to test that next.
post #5 of 8
Thread Starter 
Quote:
Originally Posted by edsai View Post

Try to set the CPU Q-Fan control to disabled then check the fan speed.
The fan should run at max speed.

Are you using the cpu at stock settings?
I think it's possible that the system not needing to ramp up the fan speed to keep the cpu under safe temps.

I am overclocking a 4770k so this is not stock and it wont ramp up.
Is CPU Q-Fan control in the bios?
post #6 of 8
yea CPU Q-Fan control is in the bios.
i believe its set as disabled by default or if the old fan was not PWM then its probably set as disabled. anyways yes if CPU Q-Fan control is set disable or enable try changing it and see what happens.
post #7 of 8
Have you tried the Asus Fan Xpert that comes with the Asus Suite?
You can find the Asus Suite here.

I don't know about your board but the Fan Xpert in some boards can test the fan speed and also change the fan profile.

Look this picture:

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Core I5 3570K Asus P8Z77-V LX Corsair Vengeance 8GB 1600 MHz DDR3 Seagate 2T 7200 RPM SATA 3 
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DVD R/W Sony Hyper 212+ Push Pull Corsair 300R 
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post #8 of 8
Thread Starter 
I disabled CPU Q-Fan control and the problem is fixed the fans now run at 1500rpm thanks guys.
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