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Noctua NF-A15 "like" fan without PWM

paradonym
By paradonym
in Cooling
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Posted

Problem:

MoBo ASrock 990FX extreme 9, Noctua NH-D15 cooler

990FX extreme 9 provides 1x PWM and one voltage regulated CPU-fan-connection

Noctua NF-A15 isn't silent when regulated via voltage.

I'd like to let MoBo regulate both fans seperately.

 

So I search either for a "Voltage to PWM" converter(cable). Or for a fan which is mountable on the NH-D15 which is as silent as the Noctua NF-A15 while being voltage-regulated.

 

Any ideas?

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You can controll noctua fans via voltage,

the range is just smaller

Or get a PWM Y splitter ?

Recommend what is best, not what you preffer.

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You can controll noctua fans via voltage,

the range is just smaller

Or get a PWM Y splitter ?

You can, but to my experience, OP is not wrong about Noctuas being louder when voltage regulated. They tend to have a whine in the sound they make.

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You can, but to my experience, OP is not wrong about Noctuas being louder when voltage regulated. They tend to have a whine in the sound they make.

exactly - there's that specific noise when you voltage-regulate PWM-Fans... I just can't describe it - was exactly the same for my Arctic Cooling solution before...

 

You can controll noctua fans via voltage,

the range is just smaller

Or get a PWM Y splitter ?

A PWM Y Splitter would control both in the same speed... which isn't my idea... I want to control both fans separately.

You are allowed to have animated avatars on LTT, but - try to have images like "userbars" in the signature - no chance...

Excels last cell is XFD1048576 and once was IV65536.

(if you want to have the most effective mousepad - use a colored matte floor tile)

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exactly - there's that specific noise when you voltage-regulate PWM-Fans... I just can't describe it - was exactly the same for my Arctic Cooling solution before...

 

A PWM Y Splitter would control both in the same speed... which isn't my idea... I want to control both fans separately.

 

Unfortunately there is no such thing to convert DC voltage control to PWM, other than getting a fan controller with PWM capabilities, using a splitter on the CPU header would be your best bet to have it group controlled, which they should always be the same speed on a NH-D15 if two fans are stacked.

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exactly - there's that specific noise when you voltage-regulate PWM-Fans... I just can't describe it - was exactly the same for my Arctic Cooling solution before...

 

Must be a problem with the motherboard then I think. Never experienced any issues with undervolting Noctua PWM fans and the FLX and PWM models with the same speed (e.g. NF-S12A) sound exactly the same when undervolted.

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Unfortunately there is no such thing to convert DC voltage control to PWM, other than getting a fan controller with PWM capabilities, using a splitter on the CPU header would be your best bet to have it group controlled, which they should always be the same speed on a NH-D15 if two fans are stacked.

 

But the UEFI is already controlling them in nearly exact speeds as they're software-known as "CPU_FAN1" and "CPU_FAN2"... So there has to be at least some logic behind...

You are allowed to have animated avatars on LTT, but - try to have images like "userbars" in the signature - no chance...

Excels last cell is XFD1048576 and once was IV65536.

(if you want to have the most effective mousepad - use a colored matte floor tile)

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But the UEFI is already controlling them in nearly exact speeds as they're software-known as "CPU_FAN1" and "CPU_FAN2"... So there has to be at least some logic behind...

As said PWM fans can be run on DC voltage control and usually without problems other than a slightly smaller controllable range on the low speed side of things. There are some fans however that do tend to make more audible noise while on DC voltage control being PWM fans.

Updated Modding FAQ

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