Noctua RPM stuck at 1300 rpm????

weehamish

weehamish

weehamish

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As the title, ive changed everything in the bios from silent to performance mode and it doesn't change.

Ive ran prime95 and it sits at 1300 rpm no matter what stress level!

Ive been in touch from the place i got it from and they think its a mobo problem but want me to send the full pc back to fix it due to it being a prebuilt.

Im not happy about this and have tried everything but the rpm will not lower from 1300 :\

Anyone have any ideas?
 
Are they PWM fans? If not then you'll only be able to control the speed with a mobo which supports voltage control on the fans.
 
Yeah the mobo does support voltage control on the fans but makes no difference, these fans are supposed to run at 500-600 rpm idle its crazy!

My max CPU temp was 55C at 100% for 10 mins at 1300 RPM and my idle is 22c so i have well enough room to reduce the speed but its impossible :\
 
But most new mobo's don't tend to default to voltage control - this is why I asked. Be worth double checking.

Also, are your fans 4-pin PWM?
 
This is why I swapped one out for a pair of akasa Apache

The noctua are 3 pin if they don't ramp down with temps
 
Yeah, 3 pin are voltage controlled only, so effectively they are just like molex fans - they can be changed if the voltage is changed but that's about it
 
Thats the thing they have the voltage adapters on them and still wont drop from 1300 rpm lol :\

Its an excellent heatsink and even at 1300 rpm its pretty quiet and i cant hear it with headphones but when im just browsing and have no slippers on my feet get cold coz it pumps out too much cold air ;\
 
Originally the only way I could get my Noctua fans to adjust speed was with voltage control and Speedfan. The gigabyte software did nothing. I had to settle for 600-1000 rpm based on a single temperate threshold and used an LNA adaptor.

I now use one of my PWM converter circuits to give me 550-1300 speeds just like a PWM fan. In a lot of respects it is better than a PWM fan I understand that sometimes, at low speeds PWM fans can tick.
 
What do you mean by Speedfan? I have the ULNA adapters on already and that only cuts 300 RPM off.

at 900 RPM now its a lot better but id still prefer to knock another 300 off if i can!
 
What motherboard do you have? Let's find out if that actually has voltage control first.

The ULNA adapters reduce voltage given to the fans, which is why you've seen the RPM drop to 900. It won't go any lower with them on their own.

On some motherboards you can use Speedfan to reduce voltages to you're fans, but sadly it doesn't work on every motherboard. For example i'm in same situation as my MSI board does not have voltage control and is not supported by Speedfan so i'm stuck until I either get a fan controller or some PWM fans.
 
Phunky said:
On some motherboards you can use Speedfan to reduce voltages to you're fans, but sadly it doesn't work on every motherboard. For example i'm in same situation as my MSI board does not have voltage control and is not supported by Speedfan so i'm stuck until I either get a fan controller or some PWM fans.
Click to expand...

Or use one of these..

pwm-converter1_zps39a96adc.jpg


..but I suppose it is a sort of fan controller really.
 
Phunky said:
What motherboard do you have? Let's find out if that actually has voltage control first.

The ULNA adapters reduce voltage given to the fans, which is why you've seen the RPM drop to 900. It won't go any lower with them on their own.

On some motherboards you can use Speedfan to reduce voltages to you're fans, but sadly it doesn't work on every motherboard. For example i'm in same situation as my MSI board does not have voltage control and is not supported by Speedfan so i'm stuck until I either get a fan controller or some PWM fans.
Click to expand...

Im using the Asus P8Z77-V, it has fan controls in the BIOS but they wont take effect :|
 
Pretty sure on that board that CPU and CPU_OPT can only be controller by PWM so that's 4-PIN fans only. However I do believe that the CHASSIS_FAN headers can control 3-Pin fans.

Make sure bios has QFAN enabled and you should then be able to control those on the CHASSIS_FAN header via voltage.

Ever since I moved away from my cheap Gigabyte Z68-D3-B3 i've not found ANY high end mobo that supports 3-Pin fan control on the CPU headers. Stupid I know, but then again don't think many new fans are 3-Pin these days.
 
Yeah thats a bit silly really, but i suppose its down to noctua really using these fans :\

Well ill try and hook it up to the Chassis header and see what happens, they are cabled tied to keep it tidy so ill probs have to snip them now......

Anyway to be 100% sure this will work before i chop the ties lol?
 
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