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A Gassy Gnome

5V PWM Fan on 4 PIN motherboard

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Posted · Original PosterOP

Hey guys!

 

I ordered a NF-A12x25 5v PWM (4 pin) fan from Noctua instead of the NF-A12x25 PWM (which is 12V I think).

 

Is there any issues with me putting this into my motherboard's 4 pin fan header?

 

Is it being 5V instead of 12V not an issue?


SETUP

2700X OCd @ 4.15Ghz

2x8GB Corsair Vengence PRO OCd @ 3533mhz [18-20-20-20-40]

RTX 2070S OCd @ 2100mhz

Asus X370-F mobo

 

SCORES:

Cinebench15: 1785

Cinebench20: 4136

3DMark/Time Spy: 10,238

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image.png.7cd5cad0bdbe9ec03c954d62ce647db3.png

The very first thing on the product page.

 

Technically, if you put the motherboard header into Voltage control mode, and locked the max voltage in the fan curve to 5V it would work, but some dumb motherboards, for example asus don't allow you to do that, and may still run it at 12volts.

 

Then, you could use Noctua voltage regulators, to step down the 12V to 5V, and it would work fine, if the fans have the same specs otherwise.

 

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Posted · Original PosterOP

Dang. I have an ASUS mobo.

 

I think Im going to go for the voltage regulator.

 

Thank Cactus.


SETUP

2700X OCd @ 4.15Ghz

2x8GB Corsair Vengence PRO OCd @ 3533mhz [18-20-20-20-40]

RTX 2070S OCd @ 2100mhz

Asus X370-F mobo

 

SCORES:

Cinebench15: 1785

Cinebench20: 4136

3DMark/Time Spy: 10,238

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Posted · Original PosterOP
33 minutes ago, Origami Cactus said:

image.png.7cd5cad0bdbe9ec03c954d62ce647db3.png

The very first thing on the product page.

 

Technically, if you put the motherboard header into Voltage control mode, and locked the max voltage in the fan curve to 5V it would work, but some dumb motherboards, for example asus don't allow you to do that, and may still run it at 12volts.

 

Then, you could use Noctua voltage regulators, to step down the 12V to 5V, and it would work fine, if the fans have the same specs otherwise.

 

I've devised a janky way of doing this without buying anything extra...

 

I have a USB header extender from NZXT that has 2 x USB ports on it. If I add the header extender, I can use the 4 pin to USB adapter that comes with the 5V PWM fan and plug it in like that.

 

Janky. But then I don't have to return it (there was drama with the order because of stock and them not shipping it).

 

Thoughts?


SETUP

2700X OCd @ 4.15Ghz

2x8GB Corsair Vengence PRO OCd @ 3533mhz [18-20-20-20-40]

RTX 2070S OCd @ 2100mhz

Asus X370-F mobo

 

SCORES:

Cinebench15: 1785

Cinebench20: 4136

3DMark/Time Spy: 10,238

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1 minute ago, A Gassy Gnome said:

I've devised a janky way of doing this without buying anything extra...

 

I have a USB header extender from NZXT that has 2 x USB ports on it. If I add the header extender, I can use the 4 pin to USB adapter that comes with the 5V PWM fan and plug it in like that.

 

Janky. But then I don't have to return it (there was drama with the order because of stock and them not shipping it).

 

Thoughts?

Would work, but you couldn't control the speed then, it would be 100% all the time. I personally made my own 4pin to usb adaptor just by splicing some cables together, and use it for using pc fans as desk fans.

 

I would most definitely just return it, if you live in european union or america. Noctua is a big company, they can take it. But it would work.

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Posted · Original PosterOP
4 minutes ago, Origami Cactus said:

Would work, but you couldn't control the speed then, it would be 100% all the time. I personally made my own 4pin to usb adaptor just by splicing some cables together, and use it for using pc fans as desk fans.

 

I would most definitely just return it, if you live in european union or america. Noctua is a big company, they can take it. But it would work.

I purchased from Scan.co.uk. I'm honestly okay not controlling the speed on this one. Its just an exhaust fan. My other NF-12x25 are 12v PWM and are used in the rest of the case.

 

Its pretty dang quiet already so provided I don't care about the potential noise and speed, then I'm good to do my janky workaround avoiding awkward return conversation, right?


SETUP

2700X OCd @ 4.15Ghz

2x8GB Corsair Vengence PRO OCd @ 3533mhz [18-20-20-20-40]

RTX 2070S OCd @ 2100mhz

Asus X370-F mobo

 

SCORES:

Cinebench15: 1785

Cinebench20: 4136

3DMark/Time Spy: 10,238

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Posted · Original PosterOP
6 minutes ago, Origami Cactus said:

Would work, but you couldn't control the speed then, it would be 100% all the time. I personally made my own 4pin to usb adaptor just by splicing some cables together, and use it for using pc fans as desk fans.

 

I would most definitely just return it, if you live in european union or america. Noctua is a big company, they can take it. But it would work.

Also, could you share your USB adapter solution? I've been keen to use some old fans I have kicking around to control via USB for an ambient temperature solution I've been planning.


SETUP

2700X OCd @ 4.15Ghz

2x8GB Corsair Vengence PRO OCd @ 3533mhz [18-20-20-20-40]

RTX 2070S OCd @ 2100mhz

Asus X370-F mobo

 

SCORES:

Cinebench15: 1785

Cinebench20: 4136

3DMark/Time Spy: 10,238

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1 minute ago, A Gassy Gnome said:

I purchased from Scan.co.uk. I'm honestly okay not controlling the speed on this one. Its just an exhaust fan. My other NF-12x25 are 12v PWM and are used in the rest of the case.

 

Its pretty dang quiet already so provided I don't care about the potential noise and speed, then I'm good to do my janky workaround avoiding awkward return conversation, right?

Scan is also a big company, and it wouldn't bother them imo, but if you think you won't regret it in the future, then yeah it is fine.

 

Just now, A Gassy Gnome said:

Also, could you share your USB adapter solution? I've been keen to use some old fans I have kicking around to control via USB for an ambient temperature solution I've been planning.

I just took a fan extension cable (fan splitter also works). I chopped the cable in half, found the positive and negative cables. Then i chopped a simple (important, because advanced usb cables have like 100 wires inside, so it would be hard) usb cable in half, found the positive and negative cable and then i combined the 2. It is really janky, so i don't condone it, probably a real fire hazard, but it works i guess.

 

Here is a similar tutorial i found, but he connects the usb directly to fan https://www.whitearmor.net/forum/topic/37808-how-to-make-simple-dual-5v-usb-powered-fans-for-your-bucket/

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Posted · Original PosterOP
17 hours ago, Origami Cactus said:

Scan is also a big company, and it wouldn't bother them imo, but if you think you won't regret it in the future, then yeah it is fine.

 

 

Very true. There was some drama in them mis-selling stuff and deliveries etc. so I kinda don't want to.

 

17 hours ago, Origami Cactus said:

 

 

I just took a fan extension cable (fan splitter also works). I chopped the cable in half, found the positive and negative cables. Then i chopped a simple (important, because advanced usb cables have like 100 wires inside, so it would be hard) usb cable in half, found the positive and negative cable and then i combined the 2. It is really janky, so i don't condone it, probably a real fire hazard, but it works i guess.

 

Here is a similar tutorial i found, but he connects the usb directly to fan https://www.whitearmor.net/forum/topic/37808-how-to-make-simple-dual-5v-usb-powered-fans-for-your-bucket/

I'm definitely going to look into this, thank you! :)


SETUP

2700X OCd @ 4.15Ghz

2x8GB Corsair Vengence PRO OCd @ 3533mhz [18-20-20-20-40]

RTX 2070S OCd @ 2100mhz

Asus X370-F mobo

 

SCORES:

Cinebench15: 1785

Cinebench20: 4136

3DMark/Time Spy: 10,238

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Why don't you just exchange it for 12V version? And pay the extra if there's any.


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Posted · Original PosterOP
On 7/3/2020 at 3:21 PM, LogicalDrm said:

Why don't you just exchange it for 12V version? And pay the extra if there's any.

Embarrassment of returning after they hecked up my order twice and I was like 'really? come on!'.


SETUP

2700X OCd @ 4.15Ghz

2x8GB Corsair Vengence PRO OCd @ 3533mhz [18-20-20-20-40]

RTX 2070S OCd @ 2100mhz

Asus X370-F mobo

 

SCORES:

Cinebench15: 1785

Cinebench20: 4136

3DMark/Time Spy: 10,238

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