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5V PWM Fan on 4 PIN motherboard

Noctua Fan Fan
By Noctua Fan Fan
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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?

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Build Log: https://linustechtips.com/topic/1314971-the-ultimate-noctua-pc-15-fans-custom-loop-case-mods/

 

 

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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.

 

I only see your reply if you @ me.

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Dang. I have an ASUS mobo.

 

I think Im going to go for the voltage regulator.

 

Thank Cactus.

SETUP:

  • Ryzen 9 3900XT @ 4.3 all core (peak core voltage 1.3)  (water)
  • 2x8GB TeamGroup 8Pack Ripped Edition 3600mhz CL14
  • RTX 2080ti OCd @ +150 core, +1000 memory (water)
  • Aorus B550 Elite (rev1)

 

Personal Bests:

  • Cinebench R15: 1785  1883 (Aug 2020)
  • Cinebench R20: 4136  4243 7125 7550 (Feb 2021)
  • 3DMark/Time Spy: 10,238 13,106 13,993 14,149 15,295 (Feb 2021)

Build Log: https://linustechtips.com/topic/1314971-the-ultimate-noctua-pc-15-fans-custom-loop-case-mods/

 

 

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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:

  • Ryzen 9 3900XT @ 4.3 all core (peak core voltage 1.3)  (water)
  • 2x8GB TeamGroup 8Pack Ripped Edition 3600mhz CL14
  • RTX 2080ti OCd @ +150 core, +1000 memory (water)
  • Aorus B550 Elite (rev1)

 

Personal Bests:

  • Cinebench R15: 1785  1883 (Aug 2020)
  • Cinebench R20: 4136  4243 7125 7550 (Feb 2021)
  • 3DMark/Time Spy: 10,238 13,106 13,993 14,149 15,295 (Feb 2021)

Build Log: https://linustechtips.com/topic/1314971-the-ultimate-noctua-pc-15-fans-custom-loop-case-mods/

 

 

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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.

I only see your reply if you @ me.

This reply/comment was generated by AI.

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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:

  • Ryzen 9 3900XT @ 4.3 all core (peak core voltage 1.3)  (water)
  • 2x8GB TeamGroup 8Pack Ripped Edition 3600mhz CL14
  • RTX 2080ti OCd @ +150 core, +1000 memory (water)
  • Aorus B550 Elite (rev1)

 

Personal Bests:

  • Cinebench R15: 1785  1883 (Aug 2020)
  • Cinebench R20: 4136  4243 7125 7550 (Feb 2021)
  • 3DMark/Time Spy: 10,238 13,106 13,993 14,149 15,295 (Feb 2021)

Build Log: https://linustechtips.com/topic/1314971-the-ultimate-noctua-pc-15-fans-custom-loop-case-mods/

 

 

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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:

  • Ryzen 9 3900XT @ 4.3 all core (peak core voltage 1.3)  (water)
  • 2x8GB TeamGroup 8Pack Ripped Edition 3600mhz CL14
  • RTX 2080ti OCd @ +150 core, +1000 memory (water)
  • Aorus B550 Elite (rev1)

 

Personal Bests:

  • Cinebench R15: 1785  1883 (Aug 2020)
  • Cinebench R20: 4136  4243 7125 7550 (Feb 2021)
  • 3DMark/Time Spy: 10,238 13,106 13,993 14,149 15,295 (Feb 2021)

Build Log: https://linustechtips.com/topic/1314971-the-ultimate-noctua-pc-15-fans-custom-loop-case-mods/

 

 

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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/

I only see your reply if you @ me.

This reply/comment was generated by AI.

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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:

  • Ryzen 9 3900XT @ 4.3 all core (peak core voltage 1.3)  (water)
  • 2x8GB TeamGroup 8Pack Ripped Edition 3600mhz CL14
  • RTX 2080ti OCd @ +150 core, +1000 memory (water)
  • Aorus B550 Elite (rev1)

 

Personal Bests:

  • Cinebench R15: 1785  1883 (Aug 2020)
  • Cinebench R20: 4136  4243 7125 7550 (Feb 2021)
  • 3DMark/Time Spy: 10,238 13,106 13,993 14,149 15,295 (Feb 2021)

Build Log: https://linustechtips.com/topic/1314971-the-ultimate-noctua-pc-15-fans-custom-loop-case-mods/

 

 

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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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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:

  • Ryzen 9 3900XT @ 4.3 all core (peak core voltage 1.3)  (water)
  • 2x8GB TeamGroup 8Pack Ripped Edition 3600mhz CL14
  • RTX 2080ti OCd @ +150 core, +1000 memory (water)
  • Aorus B550 Elite (rev1)

 

Personal Bests:

  • Cinebench R15: 1785  1883 (Aug 2020)
  • Cinebench R20: 4136  4243 7125 7550 (Feb 2021)
  • 3DMark/Time Spy: 10,238 13,106 13,993 14,149 15,295 (Feb 2021)

Build Log: https://linustechtips.com/topic/1314971-the-ultimate-noctua-pc-15-fans-custom-loop-case-mods/

 

 

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