How to set up these fans?

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raisonjohn


"You need to check the amp draw of each fan you will plug in. Check the back of the fan (sticker label), or the box, or the specs for that. You want your total amp draw for all the fans connected to a single header be less than 0.75A for safety (headers are usually up to 1A max, but some selected headers have higher...
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raisonjohn

raisonjohn

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Feb 22, 2015
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"You need to check the amp draw of each fan you will plug in. Check the back of the fan (sticker label), or the box, or the specs for that. You want your total amp draw for all the fans connected to a single header be less than 0.75A for safety (headers are usually up to 1A max, but some selected headers have higher amp capacity).

So, for example, if your fans are 0.25A each, you can safely plug 3 (not 4). If the fans are rated 0.30A, I'd only go with 2 (not 3). If the fans have different amp draw, say, 0.12A, 0.2A, 0.18, and 0.23A, then you can safely run them all."
Reference Thread: http://www.tomshardware.com/answers/id-3421660/safe-plug-multiple-case-fans-single-pin-header-fanhub.html

You also have to understand the differences between 3-pin (DC) and 4-pin (PWM) fans and headers, if you wish to control the speeds of such fans.

Other References for your further information:
http://www.tomshardware.com/answers/id-3492000/put-fans-motherboard.html
http://www.tomshardware.com/answers/id-3462346/adding-case-fans.html
http://www.tomshardware.com/answers/id-3418481/pwm-fan-connectors-air-cpu-cooler-questions.html
http://www.tomshardware.com/answers/id-3541095/pwm-fan-hub-question.html

 
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luckymatt42

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May 23, 2018
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Your MB manual should state the current limitations of your fan headers. Typically they are 1amp. The amperage rating of the fan is usually printed on the little sticker on the fan hub itself. So if your fan is 0.15A, you could safely run as many as 6.
 
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waynelugames

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Aug 4, 2018
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Thank you for your response!

I don’t know if I want to use a hub. My two front fans that are connected to the Molex 2 pin connectors run st 1000Rpm full speed, but aren’t that loud at all.

That has me wondering if there any any advantage to connecting fans to MB besides being able to monitor and control speed? What would you recommend?
 
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raisonjohn

raisonjohn

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Feb 22, 2015
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Yes, that is the only primary advantage of using the 4-pin PWM fan headers of your MB -- for you to be able to control/monitor the speed/noise of your 4-pin PWM fans (without using any other third-party fan controller or hub) by way of variable current (PWM signal), at a constant voltage (+12V).

If you are to use the 3-pin DC fan headers of your MB, you can still control/monitor the speed/noise of your 3-pin DC fans, though this time, by way of variable voltage (no PWM signal).

In your case, since you mentioned that noise is not of a concern, and your fans do not produce too much noise when running at full speed, then, your current setup (i.e., 2 fans plugged into the PSU's molex) would suffice. It is really a matter of preference in terms of speed / noise ratio. What matters more, to a certain extent, is your airflow in your chassis.

Having those 2 front fans at high (or full) speed would mean that your system is getting the max. airflow from your intake fans (high CFM of air), compared to your exhaust fan/s' (which you can set at a lower speed = lower CFM). This then will produce a good positive airflow (more intake than exhaust) inside your chassis.

Minimize dust built-up by ensuring good filters on all your intake fans.
 
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