Asus Maximus VIII Hero, 3-pin fans from NZXT H440 to the 4-pin inputs of the motherboard (?)

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G

ggerard

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Aug 15, 2015
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4,510
Hi,

I have a NZXT H440 case with a Asus VIII Hero and trying to figure out how it should work (1st time assembling a computer).

About fan control, I see the motherboard has several 4-pin inputs for (I assume) controlling the fans. The fans of the case are in a power hub that uses 3-pin connectors.

Then, I have read that
1- It is actually ok not to control the fans through the motherboard and leave them at full potency, they are quite silent
2- But you can also plug the 3pin to the 4pin inputs and the motherboard will control them without PWM but through voltage, so they'll adapt to the temperature (which? does it have a case-temperature monitoring?)

If that is the case, I have no idea how to connect the 3pin to the 4pin inputs, I guess I can connect using 1-2-3 or 2-3-4, and I suspect I can destroy something here.

So, can I connect them to the board? Is this a good idea? If yes, how to connect them?

Thx
 
Solution
Chayan4400
Don't worry. 3-pin fans are fully compatible with 4 pin headers. You really can't connect them wrong because there is a plastic guide on the header (inputs on the motherboard.) that only allows you to connect it one way:

4pin_connector_001.jpg


Regarding controlling them, it varies from motherboard to motherboard, but after checking up on your's, it looks like it is possible to control them, but you have to change some settings in the BIOS:

See page 3-42 in your manual for CPU Fan. Set Q-fan to disabled for 3 pin fans.

See page 3-43 in your manual for CHA Fan. Set Q-fan to DC Mode for 3 pin fans. You can also tell it what to read...
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Chayan4400

Chayan4400

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Apr 12, 2015
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Don't worry. 3-pin fans are fully compatible with 4 pin headers. You really can't connect them wrong because there is a plastic guide on the header (inputs on the motherboard.) that only allows you to connect it one way:

4pin_connector_001.jpg


Regarding controlling them, it varies from motherboard to motherboard, but after checking up on your's, it looks like it is possible to control them, but you have to change some settings in the BIOS:

See page 3-42 in your manual for CPU Fan. Set Q-fan to disabled for 3 pin fans.

See page 3-43 in your manual for CHA Fan. Set Q-fan to DC Mode for 3 pin fans. You can also tell it what to read in order to control temperature. CPU, MoBo, Temp Sensor

See page 4-11 for how to use FanXpert3.

FanXpert 3 allows you to use the CPU or GPU load percentage or temperatures to create a fan curve, if I remember correctly.
 
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Solution
G

ggerard

Reputable
Aug 15, 2015
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4,510
Hi Chayan440, I've seen now the physical limitation, it's impossible to make it wrong.

With regard to the fan control, the CPU fan is already covered. The external fan is already connected to the motherboard. I didn't change anything, I'm using a Noctua nh-d15. So far everything seems good (I don't remember how many pins had the connectors, I'd say 4). For the CHA fans, this is what you say.

So thanks a lot!
 
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